本文报道了 Cu[(C_6H_(11)O)_2PS_2]_2配合物单晶在 X 波段室温下的电子顺磁共振研究.电子顺磁共振谱显示出由^(63)Cu 和^(65)Cu 的磁性核引起的超精细结构以及由配体 ^(31)P 的磁性核引起的配体超精细结构.用非同轴的 g 张量和 A 张量...本文报道了 Cu[(C_6H_(11)O)_2PS_2]_2配合物单晶在 X 波段室温下的电子顺磁共振研究.电子顺磁共振谱显示出由^(63)Cu 和^(65)Cu 的磁性核引起的超精细结构以及由配体 ^(31)P 的磁性核引起的配体超精细结构.用非同轴的 g 张量和 A 张量系统的最小二乘拟合技术,严格地计算了自旋 Hamiltonian 参数.g 张量的主值表明,Cu^(2+)处在由四个配体 S 形成的平行四方形的中心,具有四角对称性,但是由于配体中两个 P 的影响,在 CuS_4平面上 A 张量的主值出现较大的各向异性.g 张量和 A 张量有一个主轴是共轴的,它们与 CuS_4平面垂直.实验上观察到电子自旋与配体中^(31)P 的相互作用是各向同性的,并获得相应的配体超精细耦合常数 A^p 值.展开更多
The anisotropic,field-dependent microwave absorption was observed in Y-Ba-Cu-0 oriented film.The hysteresis of absorption is explained by the flux trapping effect.The origin of the absorption has been discussed.
A very strong nonresonant low-field signal can be detected near and below zero resistance phase transition temperature T_c by either electron spin resonance (ESR) or nuclear magnetic resonance (NMR)in almost all syste...A very strong nonresonant low-field signal can be detected near and below zero resistance phase transition temperature T_c by either electron spin resonance (ESR) or nuclear magnetic resonance (NMR)in almost all systems of high T_c superconductive oxides. The essence of this phenomenon is that there is some loss absorption of electromagnetic radiant in the sample when it is in the normal state; and the absorption decreases obviously when it is in the superconducting state, but the absorption increases when the sample is in magnetic field, especially when the applied field H is greater than the superconducting展开更多
During the past two decades, a great deal of studies have been done in an attempt to improve the properties of the practically useful hard-magnetic material BaFe12O19 （BaM） by using the substitutional method. Unfort...During the past two decades, a great deal of studies have been done in an attempt to improve the properties of the practically useful hard-magnetic material BaFe12O19 （BaM） by using the substitutional method. Unfortunately, no remarkable progress about the basic magnetic properties has been made yet. One of the important aspects of these studies is the use of transition ions with strong anisotropy to replace the Fe3+ in BaM. The anisotropy ions reported are, for example, the first transition-metal ions Co2+[1], Fe2+[2] and the third transition-metal ions Ir4+[3] et al. The experiments show that all these anisotropy ions made a negative contribution to uniaxial anisotropy K1 at room temperature, i.e. ΔK1<0.展开更多
文摘本文报道了 Cu[(C_6H_(11)O)_2PS_2]_2配合物单晶在 X 波段室温下的电子顺磁共振研究.电子顺磁共振谱显示出由^(63)Cu 和^(65)Cu 的磁性核引起的超精细结构以及由配体 ^(31)P 的磁性核引起的配体超精细结构.用非同轴的 g 张量和 A 张量系统的最小二乘拟合技术,严格地计算了自旋 Hamiltonian 参数.g 张量的主值表明,Cu^(2+)处在由四个配体 S 形成的平行四方形的中心,具有四角对称性,但是由于配体中两个 P 的影响,在 CuS_4平面上 A 张量的主值出现较大的各向异性.g 张量和 A 张量有一个主轴是共轴的,它们与 CuS_4平面垂直.实验上观察到电子自旋与配体中^(31)P 的相互作用是各向同性的,并获得相应的配体超精细耦合常数 A^p 值.
文摘The anisotropic,field-dependent microwave absorption was observed in Y-Ba-Cu-0 oriented film.The hysteresis of absorption is explained by the flux trapping effect.The origin of the absorption has been discussed.
基金Project supported by the National Center for Research and Development on Superconductivity.
文摘A very strong nonresonant low-field signal can be detected near and below zero resistance phase transition temperature T_c by either electron spin resonance (ESR) or nuclear magnetic resonance (NMR)in almost all systems of high T_c superconductive oxides. The essence of this phenomenon is that there is some loss absorption of electromagnetic radiant in the sample when it is in the normal state; and the absorption decreases obviously when it is in the superconducting state, but the absorption increases when the sample is in magnetic field, especially when the applied field H is greater than the superconducting
文摘During the past two decades, a great deal of studies have been done in an attempt to improve the properties of the practically useful hard-magnetic material BaFe12O19 （BaM） by using the substitutional method. Unfortunately, no remarkable progress about the basic magnetic properties has been made yet. One of the important aspects of these studies is the use of transition ions with strong anisotropy to replace the Fe3+ in BaM. The anisotropy ions reported are, for example, the first transition-metal ions Co2+[1], Fe2+[2] and the third transition-metal ions Ir4+[3] et al. The experiments show that all these anisotropy ions made a negative contribution to uniaxial anisotropy K1 at room temperature, i.e. ΔK1<0.
