Quasi-2D layered Cr4Te5 thin film has attracted great attention because it possesses the high Curie temperature close to room temperature and relatively large saturation magnetization.However,the magnetic interactions...Quasi-2D layered Cr4Te5 thin film has attracted great attention because it possesses the high Curie temperature close to room temperature and relatively large saturation magnetization.However,the magnetic interactions and the nature of magnetic phase transition in the Cr4Te5 film have not been explored thoroughly.In this paper,we focused on the critical behavior of its magnetic phase transition through the epitaxial Cr4Te5 film fabricated by pulsed laser deposition(PLD).The final critical exponentsβ=0.359(2)andγ=1.54(2)were obtained by linear extrapolation together with ArrottNoakes equation of state,and their accuracy was confirmed by using the Widom scaling relation and scaling hypothesis.We find that some magnetic disorders exist in the Cr4Te5 film system,which is related to Cr4Te5 critical behavior why its critical behavior is quite far from any conventional universality class.Furthermore,we also determined that the Cr4Te5 film exhibits a quasi-2D long-range magnetic interaction.Finally,the itinerant ferromagnets of Cr4Te5 films were confirmed by the Takahashi’s self-consistent renormalization theory of spin fluctuations.Our work provides a new idea for understanding the mechanism of magnetic interactions in similar 2D layered films.展开更多
The interaction between complex magnetic structures and non-trivial band structures in ternary rare-earth GdCr_(6)Ge_(6) induces exotic and abundant electro-magnetic phenomena.In this work,we perform a systematical in...The interaction between complex magnetic structures and non-trivial band structures in ternary rare-earth GdCr_(6)Ge_(6) induces exotic and abundant electro-magnetic phenomena.In this work,we perform a systematical investigation on critical behaviors and magnetic properties of the single-crystal GdCr_(6)Ge_(6).The temperature,field,and angle dependence of magnetization unveils strong magnetic anisotropy along the c-axis and isotropic characteristic in the ab-plane.Critical exponentsβ=0.252(1),γ=0.905(9),δ=4.606(3)for H//ab,andβ=0.281(3),γ=0.991(8),δ=4.541(5)for H//c are obtained by the modified Arrott plot method(MAP)and critical isotherm(CI)analysis.The determined exponents for both directions are consistent with the theoretical prediction of a tricritical mean-field model.Based on detailed magnetization measurements and universality scaling,comprehensive magnetic phase diagrams of GdCr6Ge6for H//ab and H//c are constructed,which reveal that the external field induces a ferromagnetic(FM)transition for H//ab while a ferrimagnetic(FIM)one for H//c.Two tricritical points are determined for H//ab(11.2 K,266.3 Oe)and H//c(11.3 K,3.3 kOe)on the phase diagrams,respectively.The field-induced anisotropic magnetic configurations and multiple phases are clarified,where the moments of Gd and Cr form FM coupling for H//ab while FIM one for H//c via the interaction between Gd and Cr sublattices.展开更多
Background:In recent years,since the molecular docking technique can greatly improve the efficiency and reduce the research cost,it has become a key tool in computer-assisted drug design to predict the binding affinit...Background:In recent years,since the molecular docking technique can greatly improve the efficiency and reduce the research cost,it has become a key tool in computer-assisted drug design to predict the binding affinity and analyze the interactive mode.Results:This study introduces the key principles,procedures and the widely-used applications for molecular docking.Also,it compares the commonly used docking applications and recommends which research areas are suitable for them.Lastly,it briefly reviews the latest progress in molecular docking such as the integrated method and deep learning.Conclusion:Limited to the incomplete molecular structure and the shortcomings of the scoring function,current docking applications are not accurate enough to predict the binding affinity.However,we could improve the current molecular docking technique by integrating the big biological data into scoring function.展开更多
Using density functional calculations,we elucidate the interaction between magnons and phonons on Fe(001)and O/Fe(001)surfaces.The effective Heisenberg exchange parameters between neighbor sites(Ji)were derived by fit...Using density functional calculations,we elucidate the interaction between magnons and phonons on Fe(001)and O/Fe(001)surfaces.The effective Heisenberg exchange parameters between neighbor sites(Ji)were derived by fitting the ab initio spin spiral dispersion relation to a classical Heisenberg model.In bulk Fe,J5bhas a larger amplitude than J2b-J4b.Surface magnons were softer on the Fe(001)surface than in bulk,but were strengthened on the O/Fe(001)surface through strong interactions between the O and Fe atoms.The four calculated high-energy phonon modes of O/Fe(001)excellently agreed with the experimental measurements.The J1in O/Fe(001)decreased significantly with increasing phonon amplitude.Phonon-magnon coupling occurred more easily on O/Fe(001)than on Fe(001).The softening of the magnon on the O/Fe(001)with phonon amplitude was attributed to the reduced amplitude of longitudinal excitations.Magnetic moment of the Fe atom of the second layer(Fe2)was especially sensitive to phonon amplitude,regardless of the motion direction of the Fe2 atoms.展开更多
基金the National Natural Science Foundation of China(Grant Nos.11974181,12074386,and 11874358)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX21_0177)the Top-notch Academic Programs Project of Jiangsu Higher Education Institutions(TAPP),and the Hongque Innovation Center(No.HQ202102003).
文摘Quasi-2D layered Cr4Te5 thin film has attracted great attention because it possesses the high Curie temperature close to room temperature and relatively large saturation magnetization.However,the magnetic interactions and the nature of magnetic phase transition in the Cr4Te5 film have not been explored thoroughly.In this paper,we focused on the critical behavior of its magnetic phase transition through the epitaxial Cr4Te5 film fabricated by pulsed laser deposition(PLD).The final critical exponentsβ=0.359(2)andγ=1.54(2)were obtained by linear extrapolation together with ArrottNoakes equation of state,and their accuracy was confirmed by using the Widom scaling relation and scaling hypothesis.We find that some magnetic disorders exist in the Cr4Te5 film system,which is related to Cr4Te5 critical behavior why its critical behavior is quite far from any conventional universality class.Furthermore,we also determined that the Cr4Te5 film exhibits a quasi-2D long-range magnetic interaction.Finally,the itinerant ferromagnets of Cr4Te5 films were confirmed by the Takahashi’s self-consistent renormalization theory of spin fluctuations.Our work provides a new idea for understanding the mechanism of magnetic interactions in similar 2D layered films.
基金supported by the National Natural Science Foundation of China(Grant Nos.12074386,11874358,U1432138,11974181,12204006,and 12250410238)the Collaborative Innovation Program of Hefei Science Center,CAS(Grant No.2021HSC-CIP006)+3 种基金the Alliance of International Science Organizations(Grant No.ANSO-VF-2022-03)the Key Project of Natural Scientific Research of Universities in Anhui Province(Grant No.K120462009)the Anhui Provincial Natural Science Foundation(Grant No.2108085QA21)supported by the High Magnetic Field Laboratory of Anhui Province。
文摘The interaction between complex magnetic structures and non-trivial band structures in ternary rare-earth GdCr_(6)Ge_(6) induces exotic and abundant electro-magnetic phenomena.In this work,we perform a systematical investigation on critical behaviors and magnetic properties of the single-crystal GdCr_(6)Ge_(6).The temperature,field,and angle dependence of magnetization unveils strong magnetic anisotropy along the c-axis and isotropic characteristic in the ab-plane.Critical exponentsβ=0.252(1),γ=0.905(9),δ=4.606(3)for H//ab,andβ=0.281(3),γ=0.991(8),δ=4.541(5)for H//c are obtained by the modified Arrott plot method(MAP)and critical isotherm(CI)analysis.The determined exponents for both directions are consistent with the theoretical prediction of a tricritical mean-field model.Based on detailed magnetization measurements and universality scaling,comprehensive magnetic phase diagrams of GdCr6Ge6for H//ab and H//c are constructed,which reveal that the external field induces a ferromagnetic(FM)transition for H//ab while a ferrimagnetic(FIM)one for H//c.Two tricritical points are determined for H//ab(11.2 K,266.3 Oe)and H//c(11.3 K,3.3 kOe)on the phase diagrams,respectively.The field-induced anisotropic magnetic configurations and multiple phases are clarified,where the moments of Gd and Cr form FM coupling for H//ab while FIM one for H//c via the interaction between Gd and Cr sublattices.
基金the National Natural Science Foundation of China (No.61372138)the National Science and Technology Major Project of China (No.2018ZX10201002).
文摘Background:In recent years,since the molecular docking technique can greatly improve the efficiency and reduce the research cost,it has become a key tool in computer-assisted drug design to predict the binding affinity and analyze the interactive mode.Results:This study introduces the key principles,procedures and the widely-used applications for molecular docking.Also,it compares the commonly used docking applications and recommends which research areas are suitable for them.Lastly,it briefly reviews the latest progress in molecular docking such as the integrated method and deep learning.Conclusion:Limited to the incomplete molecular structure and the shortcomings of the scoring function,current docking applications are not accurate enough to predict the binding affinity.However,we could improve the current molecular docking technique by integrating the big biological data into scoring function.
基金supported by the National Natural Science Foundation of China(Grant Nos.11204131,11374159,and 11974181)the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(Grant No.17KJA140001)。
文摘Using density functional calculations,we elucidate the interaction between magnons and phonons on Fe(001)and O/Fe(001)surfaces.The effective Heisenberg exchange parameters between neighbor sites(Ji)were derived by fitting the ab initio spin spiral dispersion relation to a classical Heisenberg model.In bulk Fe,J5bhas a larger amplitude than J2b-J4b.Surface magnons were softer on the Fe(001)surface than in bulk,but were strengthened on the O/Fe(001)surface through strong interactions between the O and Fe atoms.The four calculated high-energy phonon modes of O/Fe(001)excellently agreed with the experimental measurements.The J1in O/Fe(001)decreased significantly with increasing phonon amplitude.Phonon-magnon coupling occurred more easily on O/Fe(001)than on Fe(001).The softening of the magnon on the O/Fe(001)with phonon amplitude was attributed to the reduced amplitude of longitudinal excitations.Magnetic moment of the Fe atom of the second layer(Fe2)was especially sensitive to phonon amplitude,regardless of the motion direction of the Fe2 atoms.