In this article we briefly review new quantum functional compounds primarily based on our recent works.We will highlight the effects of pressures on both materials synthesis and quantum tuning.The contents include(I)&...In this article we briefly review new quantum functional compounds primarily based on our recent works.We will highlight the effects of pressures on both materials synthesis and quantum tuning.The contents include(I)"111"-type iron based superconducting system,(II)pressure induced superconductivity in topological insulators and(III)the new diluted magnetic semiconductors with decoupled spin charge doping.展开更多
The local electronic structure and mag- netic properties of diluted magnetic semiconductor (Ga,Cr)N have been studied by using discrete varia- tional method (DVM) based on density functional theory. The magnetic momen...The local electronic structure and mag- netic properties of diluted magnetic semiconductor (Ga,Cr)N have been studied by using discrete varia- tional method (DVM) based on density functional theory. The magnetic moments per Cr atom vary significantly with Cr concentration, and the trend of variation is in agreement with that of the experiment. The coupling between Cr atoms in the system with two Cr atoms considered is found to be ferromagnetic, and the magnetic moment per Cr atom is similar to the case in which only one Cr atom is considered in the same doping concentration. For all doping con- centrations, the coupling between Cr and the nearest neighbor N is found to be antiferromagnetic, and the Cr 3d states hybridize strongly with N 2p states, which are in agreement with the band calculations.展开更多
Zn1xMnxO nanowires were synthesized through chemical vapor deposition of pure Zn and MnCl2 power mixtures on silicon substrates. The morphology, structure and composition were meas-ured by SEM, TEM, EDX and XRD. Magne...Zn1xMnxO nanowires were synthesized through chemical vapor deposition of pure Zn and MnCl2 power mixtures on silicon substrates. The morphology, structure and composition were meas-ured by SEM, TEM, EDX and XRD. Magnetic proper-ties were measured by SQUID. The results show that the nanowires exhibit clear ferromagnetic behavior at low temperature. An abnormal peak is observed in the M-T curve at 55 K in a magnetic field of 500 Oe.展开更多
Diluted magnetic semiconductors(DMS)have received much attention due to the potential applications to spintronics devices.A prototypical DMS(Ga,Mn)As has been widely studied since the 1990s.The simultaneous spin and c...Diluted magnetic semiconductors(DMS)have received much attention due to the potential applications to spintronics devices.A prototypical DMS(Ga,Mn)As has been widely studied since the 1990s.The simultaneous spin and charge doping via hetero-valence(Ga^(3+),Mn^(2+))substitution,however,not only leads to incapability of controlling magnetic&carriers freedom separately,but also results in severely limited solubility without bulk specimens.Recently the group led by Prof.Jin Changqing at Institute of Physics of Chinese Academy of Sciences(IOPCAS),in展开更多
基金supported by the National Natural Science Foundation of China and Ministry of Science and Technology(MOST)
文摘In this article we briefly review new quantum functional compounds primarily based on our recent works.We will highlight the effects of pressures on both materials synthesis and quantum tuning.The contents include(I)"111"-type iron based superconducting system,(II)pressure induced superconductivity in topological insulators and(III)the new diluted magnetic semiconductors with decoupled spin charge doping.
基金supported by the National Natural Science Foundation of China(Grant No.10347010)the Anhui Institute of Solid State Physics of CAS.
文摘The local electronic structure and mag- netic properties of diluted magnetic semiconductor (Ga,Cr)N have been studied by using discrete varia- tional method (DVM) based on density functional theory. The magnetic moments per Cr atom vary significantly with Cr concentration, and the trend of variation is in agreement with that of the experiment. The coupling between Cr atoms in the system with two Cr atoms considered is found to be ferromagnetic, and the magnetic moment per Cr atom is similar to the case in which only one Cr atom is considered in the same doping concentration. For all doping con- centrations, the coupling between Cr and the nearest neighbor N is found to be antiferromagnetic, and the Cr 3d states hybridize strongly with N 2p states, which are in agreement with the band calculations.
文摘Zn1xMnxO nanowires were synthesized through chemical vapor deposition of pure Zn and MnCl2 power mixtures on silicon substrates. The morphology, structure and composition were meas-ured by SEM, TEM, EDX and XRD. Magnetic proper-ties were measured by SQUID. The results show that the nanowires exhibit clear ferromagnetic behavior at low temperature. An abnormal peak is observed in the M-T curve at 55 K in a magnetic field of 500 Oe.
文摘Diluted magnetic semiconductors(DMS)have received much attention due to the potential applications to spintronics devices.A prototypical DMS(Ga,Mn)As has been widely studied since the 1990s.The simultaneous spin and charge doping via hetero-valence(Ga^(3+),Mn^(2+))substitution,however,not only leads to incapability of controlling magnetic&carriers freedom separately,but also results in severely limited solubility without bulk specimens.Recently the group led by Prof.Jin Changqing at Institute of Physics of Chinese Academy of Sciences(IOPCAS),in
