期刊文献+
共找到2,372篇文章
< 1 2 119 >
每页显示 20 50 100
Miniaturized time-of-flight neutron spin flipper using a high-TC superconductor 被引量:1
1
作者 Yu-Chen Dong Tian-Hao Wang +8 位作者 Wolfgang Kreuzpaintner Xiao-Tao Liu Ze-Hui Li Yu-Dong Kang Jun-Pei Zhang Long Tian Chu-Yi Huang Bo Bai Xin Tong 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第11期113-119,共7页
A miniaturized neutron spin flipper based on a high-TC superconductor film,developed at the China Spallation Neutron Source(CSNS),is presented.A neutron spin flipper is an essential component for performing polarized ... A miniaturized neutron spin flipper based on a high-TC superconductor film,developed at the China Spallation Neutron Source(CSNS),is presented.A neutron spin flipper is an essential component for performing polarized neutron experiments and,as such,constitutes a high priority for developing CSNS’s polarized neutron capability.To provide the beamlines with a universal neutron spin flipper operating over a wide wavelength band,the neutron spin flipper utilizes non-adiabatic spin flipping during transit through opposite magnetic fields that are mutually shielded by the superconductor Meissner effect.A compact vacuum heat shield and a low-power consumption sterling refrigerator maintained the superconducting condition while reducing the size and power input of the flipper.The prototype device was tested at the CSNS BL-20,which demonstrated a flipping efficiency of 99%at 4 A°. 展开更多
关键词 NEUTRON superconductor SCATTERING Spinflipper
下载PDF
The Correlation of Miller Indices with the Conductivity Mechanism of Cu-Based High-Tc Superconductor
2
作者 Israa Maher Emad K. Al-Shakarchi 《Journal of Modern Physics》 2017年第8期1143-1151,共9页
The high temperature superconductor of CuBa2Ca2Cu3O8+&delta;(Cu-1223) was synthesized experimentally by solid-state reaction. There were many pa-rameters affecting the preparation technique such as oxygen flow, si... The high temperature superconductor of CuBa2Ca2Cu3O8+&delta;(Cu-1223) was synthesized experimentally by solid-state reaction. There were many pa-rameters affecting the preparation technique such as oxygen flow, sintering temperature, sintering time, and compacted pressure. The XRD-pattern exhibited a tetragonal phase for both Cu-1223, and Cu-1212. The resistivity measurement was considered the important experiment to show the predominant phase of superconductor if it was a high phase or low phase. The critical temperature (Tc) was about (128 K) for the high phase of Cu-1223, whereas the low phase of (Cu-1212) appeared at (Tc = 64 K). The correlation between the Miller indices and resistivity measurements was a good tool to predicate the expected mechanism of conductivity within the unit cell. It was clear that the arrangement of these planes was aligned in the a-c direction. That should make the motion of the charge to be simpler by a stepping plane toward c-axis. 展开更多
关键词 SOLID-STATE Reaction high-tc superconductor RESISTIVITY Measurement XRD-Pattern SEM Analysis
下载PDF
X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF THE SINGLE PHASE HIGH-Tc SUPERCONDUCTOR YBa_(2)Cu_(3)O_(9-δ)
3
作者 JI Mingrong HE Zhenghui +4 位作者 WU Jianxin CHEN Zhuyao QIAN Yitai PAN Guoqiang ZHANG Qirui 《Chinese Physics Letters》 SCIE CAS 1988年第3期117-120,共4页
X-ray Photcelectron Spectroscopy(XPS)was employed to study the single phase high-Tc superconductor YBa_(2)Cu_(3)O_(9-δ).Comparison.Of the observed valence band spectrum with the theoretical spectrum of Mattheiss is g... X-ray Photcelectron Spectroscopy(XPS)was employed to study the single phase high-Tc superconductor YBa_(2)Cu_(3)O_(9-δ).Comparison.Of the observed valence band spectrum with the theoretical spectrum of Mattheiss is given.The core level spectrum of Ba 3d5/2 was examined.The results of Y_(2)Cu_(2)O_(5)and Y_(2)BaCuO_(5)are also reported. 展开更多
关键词 SPECTRUM superconductor VALENCE
下载PDF
DOUBLE PEAK STRUCTURE OF O_(18) IN PHOTOEMISSION SPECTRA OF Bi-Sr-Ca-O HIGH-Tc SUPERCONDUCTORS
4
作者 LIU Zhenxiang XIE Kan +2 位作者 WU Naijuan SHEN Dianhong LIN Zhangda 《Chinese Physics Letters》 SCIE CAS CSCD 1989年第6期261-264,共4页
The double peak structure of O_(18) in photoemission spectra of Bi-Sr-Ca-Cu-O superconductor is studied by XPS,and compared with that of SrCO_(3).The result indicates that the double peak structure of O_(18) spectra i... The double peak structure of O_(18) in photoemission spectra of Bi-Sr-Ca-Cu-O superconductor is studied by XPS,and compared with that of SrCO_(3).The result indicates that the double peak structure of O_(18) spectra is closely related with the Sr_(3d) and C_(1s) spectra,and arises primarily from the SrCO_(3)-like complex caused by the contamination of CO_(2) in air. 展开更多
关键词 SPECTRA superconductor
下载PDF
Evolution of Superconducting-Transition Temperature with Superfluid Density and Conductivity in Pressurized Cuprate Superconductors 被引量:1
5
作者 赵金瑜 蔡树 +15 位作者 陈逸雯 顾根大 闫宏涛 郭静 韩金宇 王鹏玉 周亚洲 李延春 李晓东 任治安 吴奇 周兴江 丁阳 向涛 毛河光 孙力玲 《Chinese Physics Letters》 SCIE EI CAS CSCD 2024年第4期110-117,共8页
What factors fundamentally determine the value of superconducting transition temperature Tc in high temperature superconductors has been the subject of intense debate.Following the establishment of an empirical law kn... What factors fundamentally determine the value of superconducting transition temperature Tc in high temperature superconductors has been the subject of intense debate.Following the establishment of an empirical law known as Homes'law,there is a growing consensus in the community that the Tc value of the cuprate superconductors is closely linked to the superfluid density(ρ_(s))of its ground state and the conductivity(σ)of its normal state.However,all the data supporting this empirical law(ρ_(s)=AσT_(c))have been obtained from the ambientpressure superconductors.In this study,we present the first high-pressure results about the connection of the quantities of ρ_(s) and σ with T_(c),through the studies on the Bi_(1.74)Pb_(0.38)Sr_(1.88)CuO_(6+δ)and Bi_(2)Sr_(2)CaCu_(2)O_(8+δ),in which the value of their high-pressure resistivity(ρ=1/σ)is achieved by adopting our newly established method,while the quantity ofρs is extracted using Homes'law.We highlight that the Tc values are strongly linked to the joint response factors of magnetic field and electric field,i.e.,ρ_(s) and σ,respectively,implying that the physics determining T_(c) is governed by the intrinsic electromagnetic fields of the system. 展开更多
关键词 superconductorS TRANSITION CONDUCTIVITY
下载PDF
Strong Anisotropic Order Parameters at All-Nitride Ferromagnet/Superconductor Interfaces
6
作者 Qiao Jin Meng Yang +16 位作者 Guozhu Song Nan Zhao Shengru Chen Haitao Hong Ting Cui Dongke Rong Qianying Wang Yiyan Fan Chen Ge Can Wang Jiachang Bi Yanwei Cao Liusuo Wu Shanmin Wang Kui-Juan Jin Zhi-Gang Cheng Er-Jia Guo 《Chinese Physics Letters》 SCIE EI CAS CSCD 2024年第2期102-111,共10页
Proximity effects between superconductors and ferromagnets(SC/FM)hold paramount importance in comprehending the spin competition transpiring at their interfaces.This competition arises from the interplay between Coope... Proximity effects between superconductors and ferromagnets(SC/FM)hold paramount importance in comprehending the spin competition transpiring at their interfaces.This competition arises from the interplay between Cooper pairs and ferromagnetic exchange interactions.The proximity effects between transition metal nitrides(TMNs)are scarcely investigated due to the formidable challenges of fabricating high-quality SC/FM interfaces.We fabricated heterostructures comprising SC titanium nitride(TiN)and FM iron nitride(Fe_(3)N)with precise chemical compositions and atomically well-defined interfaces.The magnetoresistance of Fe_(3)N/TiN heterostructures shows a distinct magnetic anisotropy and strongly depends on the external perturbations.Moreover,the superconducting transition temperatureT_(C) and critical field of TiN experience notable suppression when proximity to Fe_(3)N.We observe the intriguing competition of interfacial spin orientations near𝑇T_(C)(∼1.25 K).These findings not only add a new materials system for investigating the interplay between superconductor and ferromagnets,but also potentially provide a building block for future research endeavors and applications in the realms of superconducting spintronic devices. 展开更多
关键词 PROXIMITY superconductor titanium
下载PDF
Controversy Clouds Real Progress in Superconductor Research
7
作者 Mark Peplow 《Engineering》 SCIE EI CAS CSCD 2024年第7期8-10,共3页
In the 8 March 2023 issue of the journal Nature,a paper attracted global attention with the report of a new superconductor material exhibiting ground-breaking properties[1,2].A group led by Ranga P.Dias,assistant prof... In the 8 March 2023 issue of the journal Nature,a paper attracted global attention with the report of a new superconductor material exhibiting ground-breaking properties[1,2].A group led by Ranga P.Dias,assistant professor of mechanical engineering at the University of Rochester(Rochester,NY,USA),described a hydride material that superconducted at around room temperature,albeit at pressures 10000 times greater than atmospheric pressure[3]. 展开更多
关键词 superconductor JOURNAL superconductor
下载PDF
Design of high-temperature superconductors at moderate pressures by alloying AlH3 or GaH3
8
作者 Xiaowei Liang Xudong Wei +4 位作者 Eva Zurek Aitor Bergara Peifang Li Guoying Gao Yongjun Tian 《Matter and Radiation at Extremes》 SCIE EI CSCD 2024年第1期94-103,共10页
Since the discovery of hydride superconductors,a significant challenge has been to reduce the pressure required for their stabilization.In this context,we propose that alloying could be an effective strategy to achiev... Since the discovery of hydride superconductors,a significant challenge has been to reduce the pressure required for their stabilization.In this context,we propose that alloying could be an effective strategy to achieve this.We focus on a series of alloyed hydrides with the AMH_(6)composition,which can be made via alloying A15 AH_(3)(A=Al or Ga)with M(M=a group IIIB or IVB metal),and study their behavior under pressure.Seven of them are predicted to maintain the A15-type structure,similar to AH_(3)under pressure,providing a platform for studying the effects of alloying on the stability and superconductivity of AH_(3).Among these,the A15-type phases of AlZrH_(6)and AlHfH_(6)are found to be thermodynamically stable in the pressure ranges of 40–150 and 30–181 GPa,respectively.Furthermore,they remain dynamically stable at even lower pressures,as low as 13 GPa for AlZrH_(6)and 6 GPa for AlHfH_(6).These pressures are significantly lower than that required for stabilizing A15 AlH3.Additionally,the introduction of Zr or Hf increases the electronic density of states at the Fermi level compared with AlH3.This enhancement leads to higher critical temperatures(Tc)of 75 and 76 K for AlZrH_(6)and AlHfH_(6)at 20 and 10 GPa,respectively.In the case of GaMH_(6)alloys,where M represents Sc,Ti,Zr,or Hf,these metals reinforce the stability of the A15-type structure and reduce the lowest thermodynamically stable pressure for GaH_(3) from 160 GPa to 116,95,80,and 85 GPa,respectively.Particularly noteworthy are the A15-type GaMH_(6)alloys,which remain dynamically stable at low pressures of 97,28,5,and 6 GPa,simultaneously exhibiting high Tc of 88,39,70,and 49 K at 100,35,10,and 10 GPa,respectively.Overall,these findings enrich the family of A15-type superconductors and provide insights for the future exploration of high-temperature hydride superconductors that can be stabilized at lower pressures. 展开更多
关键词 ALLOYING ALLOYS superconductorS
下载PDF
Prediction of novel layered indium halide superconductors
9
作者 Zhi-Hong Yuan Jing-Jing Meng +2 位作者 Rui Liu Peng-Yu Zheng Zhi-Ping Yin 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第10期388-393,共6页
We design two new layered indium halide compounds LaOInF_(2)and LaOInCl_(2)by means of first-principles calculations and evolutionary crystal structure prediction.We find both compounds crystallize in a tetragonal str... We design two new layered indium halide compounds LaOInF_(2)and LaOInCl_(2)by means of first-principles calculations and evolutionary crystal structure prediction.We find both compounds crystallize in a tetragonal structure with P4/nmm space group and have indirect band gaps of 2.58 eV and 3.21 eV,respectively.By substituting O with F,both of them become metallic and superconducting at low temperature.The F-doping leads to strong electron-phonon coupling in the low-energy acoustic phonon modes which is mainly responsible for the induced superconductivity.The total electron-phonon coupling strength are 1.86 and 1.48,while the superconducting transition temperature(T_(c))are about 7.2 K and 6.5 K with 10%and 5%F doping for LaOInF_(2)and LaOInCl_(2),respectively. 展开更多
关键词 superconductor LaOInF_(2) LaOInCl_(2) electron-phonon coupling
下载PDF
Two-fold symmetry of the in-plane resistance in kagome superconductor Cs(V_(1-x)Ta_(x))_(3)Sb_(5) with enhanced superconductivity
10
作者 赵振 王汝文 +11 位作者 张宇航 祝轲 余维琪 韩烨超 刘家利 胡国静 郭辉 林晓 董晓莉 陈辉 杨海涛 高鸿钧 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第7期9-14,共6页
The kagome superconductor CsV_(3)Sb_(5) has attracted widespread attention due to its rich correlated electron states including superconductivity, charge density wave(CDW), nematicity, and pair density wave. Notably, ... The kagome superconductor CsV_(3)Sb_(5) has attracted widespread attention due to its rich correlated electron states including superconductivity, charge density wave(CDW), nematicity, and pair density wave. Notably, the modulation of the intertwined electronic orders by the chemical doping is significant to illuminate the cooperation/competition between multiple phases in kagome superconductors. In this study, we have synthesized a series of tantalum-substituted Cs(V_(1-x)Ta_(x))_(3)Sb_(5) by a modified self-flux method. Electrical transport measurements reveal that CDW is suppressed gradually and becomes undetectable as the doping content of x is over 0.07. Concurrently, the superconductivity is enhanced monotonically from T_(c) ~ 2.8 K at x = 0 to 5.2 K at x = 0.12. Intriguingly, in the absence of CDW, Cs(V_(1-x)Ta_(x))_(3)Sb_(5)(x = 0.12) crystals exhibit a pronounced two-fold symmetry of the in-plane angular-dependent magnetoresistance(AMR) in the superconducting state, indicating the anisotropic superconducting properties in the Cs(V_(1-x)Ta_(x))_(3)Sb_(5). Our findings demonstrate that Cs(V_(1-x)Ta_(x))_(3)Sb_(5) with the non-trivial band topology is an excellent platform to explore the superconductivity mechanism and intertwined electronic orders in quantum materials. 展开更多
关键词 kagome superconductor charge density wave rotation symmetry breaking
下载PDF
Topological superconductors with spin-triplet pairings and Majorana Fermi arcs
11
作者 黄石 罗熙 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第8期453-458,共6页
We construct a three-dimensional topological superconductor Bogoliubov–de Gennes(BdG)Hamiltonian with the normal state being a three-dimensional topological insulator.By introducing inter-orbital spin-triplet pairing... We construct a three-dimensional topological superconductor Bogoliubov–de Gennes(BdG)Hamiltonian with the normal state being a three-dimensional topological insulator.By introducing inter-orbital spin-triplet pairings term△3,there are topological Majorana nodes in the bulk and they are connected by Majorana Fermi arcs on the surface,similar to the case of Weyl semimetal.Furthermore,by adding an inversion-breaking term to the normal state,momentum-independent pairing terms with different parities can coexist in the Bd G Hamiltonian,which creates more Majorana modes similar to Andreev bound states and a richer phase diagram. 展开更多
关键词 topological surface states topological superconductors topological nodes Weyl points Majorana Fermi arcs
下载PDF
Effect of the mixing of s-wave and chiral p-wave pairings on electrical shot noise properties of normal metal/superconductor tunnel junctions
12
作者 胡雨辰 胡梁宾 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第7期538-545,共8页
We study theoretically the electrical shot noise properties of tunnel junctions between a normal metal and a superconductor with the mixture of singlet s-wave and chiral triplet p-wave pairing due to broken inversion ... We study theoretically the electrical shot noise properties of tunnel junctions between a normal metal and a superconductor with the mixture of singlet s-wave and chiral triplet p-wave pairing due to broken inversion symmetry. We investigate how the shot noise properties vary as the relative amplitude between the two parity components in the pairing potential is changed. It is demonstrated that some characteristics of the electrical shot noise properties of such tunnel junctions may depend sensitively on the relative amplitude between the two parity components in the pairing potential, and some significant changes may occur in the electrical shot noise properties when the relative amplitude between the two parity components is varied from the singlet s-wave pairing dominated regime to the chiral triplet p-wave pairing dominated regime. In the chiral triplet p-wave pairing dominated regime, the ratio of noise power to electric current is close to 2e both in the in-gap and in the out-gap region. In the singlet s-wave pairing dominated regime, the value of this ratio is close to 4e in the inner gap region but may reduce to about 2e in the outer gap region as the relative amplitude of the chiral triplet pairing component is increased. The variations of the differential shot noise with the bias voltage also exhibit some significantly different features in different regimes. Such different features can serve as useful diagnostic tools for the determination of the relative magnitude of the two parity components in the pairing potential. 展开更多
关键词 normal metal/superconductor tunnel junctions shot noise mixing of s-wave and chiral p-wave pairing spin–orbit coupling
下载PDF
High Harmonic Spectroscopy Retrieves Electronic Structure of High-pressure Superconductors
13
《Bulletin of the Chinese Academy of Sciences》 2024年第1期43-44,共2页
High pressure has revealed surprising physics and creates novel states in condensed matter.Exciting examples include near-roomtemperature superconductivity(T_(c)>200 K)in highlypressured hydrides such as H_(3)S and... High pressure has revealed surprising physics and creates novel states in condensed matter.Exciting examples include near-roomtemperature superconductivity(T_(c)>200 K)in highlypressured hydrides such as H_(3)S and LaH_(10). 展开更多
关键词 superconductor hydrides Structure
下载PDF
Electronic Structure Investigation of 12442 Iron-Based Superconductors Based on Block-Layer Model
14
作者 Jianan Bian Xinyuan Jiang +1 位作者 Yuchen Zou Yiming Yu 《材料科学与工程(中英文B版)》 2024年第1期21-26,共6页
Superconducting transition temperature(Tc),as a crucial parameter,exploring its relationship with various macroscopic and microscopic factors helps to understand the mechanism of high-temperature superconductivity fro... Superconducting transition temperature(Tc),as a crucial parameter,exploring its relationship with various macroscopic and microscopic factors helps to understand the mechanism of high-temperature superconductivity from multiple perspectives,aiding in a multidimensional comprehension of high-temperature superconductivity mechanisms.Drawing inspiration from the block-layer structure models of cuprate superconductors,we computationally investigated the interlayer interaction energies in the 12442-type iron-based superconducting materials AkCa_(2)Fe_(4)As_(4)F_(2)(Ak=K,Rb,Cs)systems based on the block-layer model and explored their relationship with Tc.We observed that an increase in interlayer combinative energy leads to a decrease in Tc,while conversely,a decrease in interlayer combination energy results in an increase in Tc.Further,we found that the contribution of the Fe 3d band structure,especially the 3dz2 orbital,to charge transfer is significant. 展开更多
关键词 Block-layer structural mode iron-based superconductor combinative energy superconducting transition temperature
下载PDF
SOFTENING OF VIBRATIONAL MODES OF THE HIGH-Tc PHASE OF Bi-SYSTEM SUPERCONDUCTOR
15
作者 李阳 曹国辉 +2 位作者 马如璋 程本培 孔捷 《Nuclear Science and Techniques》 SCIE CAS CSCD 1992年第2期78-82,共5页
The temperature dependent Fe Mossbauer and X-ray diffraction measurement on Bi-system 2:2:2:3 phase have been carried out from 77 K to 300 K. It was found that there are two anomalous behaviors of lattice vibrational ... The temperature dependent Fe Mossbauer and X-ray diffraction measurement on Bi-system 2:2:2:3 phase have been carried out from 77 K to 300 K. It was found that there are two anomalous behaviors of lattice vibrational modes near 125 K and 220 K. This phenomena of lattice softening above Tc is taken as a precursor effect of superconductivity. 展开更多
关键词 MOSSBAUER effect high-tc superconductor LATTICE SOFTENING X-ray DIFFRACTION
下载PDF
PAT study on stress-field pinning in high-Tc superconductors
16
作者 李阳 王耘波 +5 位作者 唐春光 马庆珠 曹国辉 魏龙 王文华 张天保 《Science China Mathematics》 SCIE 1997年第9期978-984,共7页
The simultaneous measurements of Doppler-broadened radiation spectra and lifetime spectra were performed by positron annihilation analysis on Eu-doped Y-123 superconductors.When the doping concentration reaches 30 % a... The simultaneous measurements of Doppler-broadened radiation spectra and lifetime spectra were performed by positron annihilation analysis on Eu-doped Y-123 superconductors.When the doping concentration reaches 30 % and 70 %,the density of defeat and its stress-field reach the maximum for (Y1-xEux) Ba2Cu3O7-y The pinning mechanism of such superconductors is discussed,and the results support the stress pinning mechanism. 展开更多
关键词 Y-123 superconductor Eu-doping stress-field pinning.
原文传递
Customizing topological phases in the twisted bilayer superconductors with even-parity pairings
17
作者 林丛豪 黄传帅 卢仙聪 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第8期1-5,共5页
We investigate the topological properties of twisted bilayer superconductors with different even-parity pairings in each layer.In the presence of spin-orbit coupling,the Hamiltonian is mapped into an effective odd-par... We investigate the topological properties of twisted bilayer superconductors with different even-parity pairings in each layer.In the presence of spin-orbit coupling,the Hamiltonian is mapped into an effective odd-parity superconductor.Based on this,we deduce the topological properties by examining the relative configuration between Fermi surface and Dirac pairing node.We show that mixed Rashba and Dresselhaus spin-orbit coupling and anisotropic hopping terms,which break the C_(4)symmetry of the Fermi surface,can induce first-order topological superconductors with non-zero bulk Chern number.This provides a versatile way to control the topological phases of bilayer superconductors by adjusting the twisted angle and chemical potential.We demonstrate our results using a typical twisted angle of 53.13°,at which the translation symmetry is restored and the Chern number and edge state are calculated using the Moir′e momentum. 展开更多
关键词 topological superconductors bilayer superconductors twistronics spin-orbit coupling
下载PDF
Gate-Tunable Negative Differential Conductance in Hybrid Semiconductor–Superconductor Devices
18
作者 刘明黎 潘东 +10 位作者 乐天 贺江波 贾仲谋 朱尚 杨光 吕昭征 刘广同 沈洁 赵建华 吕力 屈凡明 《Chinese Physics Letters》 SCIE EI CAS CSCD 2023年第6期50-55,共6页
Negative differential conductance(NDC)serves as a crucial characteristic that reveals various underlying physics and transport process in hybrid superconducting devices.We report the observation of gate-tunable NDC ou... Negative differential conductance(NDC)serves as a crucial characteristic that reveals various underlying physics and transport process in hybrid superconducting devices.We report the observation of gate-tunable NDC outside the superconducting energy gap on two types of hybrid semiconductor–superconductor devices,i.e.,normal metal–superconducting nanowire–normal metal and normal metal–superconducting nanowire–superconductor devices.Specifically,we study the dependence of the NDCs on back-gate voltage and magnetic field.When the back-gate voltage decreases,these NDCs weaken and evolve into positive differential conductance dips;and meanwhile they move away from the superconducting gap towards high bias voltage,and disappear eventually.In addition,with the increase of magnetic field,the NDCs/dips follow the evolution of the superconducting gap,and disappear when the gap closes.We interpret these observations and reach a good agreement by combining the Blonder–Tinkham–Klapwijk(BTK)model and the critical supercurrent effect in the nanowire,which we call the BTK-supercurrent model.Our results provide an in-depth understanding of the tunneling transport in hybrid semiconductor–superconductor devices. 展开更多
关键词 superconductor TRANSPORT eventually
下载PDF
Abnormal magnetoresistance effect in the Nb/Si superconductor–semiconductor heterojunction
19
作者 胡志伟 邱祥冈 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第3期484-490,共7页
Ultrathin superconducting Nb films of about 8 nm thick have been deposited on heavily doped Si substrates through DC magnetron sputtering and then the high-quality Nb/Si superconductor–semiconductor heterojunctions h... Ultrathin superconducting Nb films of about 8 nm thick have been deposited on heavily doped Si substrates through DC magnetron sputtering and then the high-quality Nb/Si superconductor–semiconductor heterojunctions have been fabricated by electron beam lithography and reactive ion etching.An abnormal magnetoresistance effect,which manifests itself as a zero field resistance peak under a magnetic field applied perpendicular to the interface,has been distinctly observed when the Nb film is in the superconductiing state.By considering the heterojunction interface being equivalent to the structure of superconductor–barrier layer–superconductor configuration,we could generally understand this unusual effect based on the Andreev reflection mechanism.Our results can be of help for the future development on compatibility and scalability of the silicon-based nanoscale superconducting devices for integrated circuits and superconducting quantum electronics. 展开更多
关键词 superconductor MAGNETORESISTANCE HETEROJUNCTION
下载PDF
Anisotropy of Electronic Spin Texture in the High-Temperature Cuprate Superconductor Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)
20
作者 刘文晶 查鹤鸣 +3 位作者 顾根大 沈晓萍 叶茂 乔山 《Chinese Physics Letters》 SCIE EI CAS CSCD 2023年第3期45-48,共4页
Seeking new order parameters and the related broken symmetry and studying their relationship with phase transition have been important topics in condensed matter physics.Here,by using spin-and angle-resolved photoemis... Seeking new order parameters and the related broken symmetry and studying their relationship with phase transition have been important topics in condensed matter physics.Here,by using spin-and angle-resolved photoemission spectroscopy,we confirm the helical spin texture caused by spin-layer locking in the nodal region in the cuprate superconductor Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)and discover the anisotropy of spin polarizations at nodes alongΓ–X andΓ–Y directions.The breaking of C_(4)rotational symmetry in electronic spin texture may give deeper insights into understanding the ground state of cuprate superconductors. 展开更多
关键词 SYMMETRY superconductor BREAKING
下载PDF
上一页 1 2 119 下一页 到第
使用帮助 返回顶部