Electron paramagnetic resonance governed by the Dzyaloshinsky - Moriya antisymmetric exchange interaction in
Electron paramagnetic resonance governed by the Dzyaloshinsky - Moriya antisymmetric exchange interaction in
复制标题
由 Dzyaloshinsky - Moriya 反对称交换相互作用控制的电子顺磁共振
DOI：
10.1088/0953-8984/8/15/012
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
J. Akimitsu
中科院分区：
文献类型：
--
作者：
I. Yamada;M. Nishi;J. Akimitsu
到目前为止，已经出现了几个关于自旋-佩尔斯化合物的电子顺磁共振实验的报道，但是没有一个能精确地解释谱线加宽的起源以及谱线宽度和共振场的温度依赖性，所有这些都不同于常规的一维海森堡反铁磁体，其中偶极或各向异性交换相互作用导致谱线加宽。在本报告中，澄清了c轴上最近邻Cu自旋之间的反对称交换相互作用与c轴（磁链）控制着表征EPR线的所有因素，即，的值和角度依赖性的线宽在高温下的短程秩序是完全不存在的，线宽的温度依赖性，和谐振场，以及高温线型。结果表明，该化合物的晶体对称性低于Vollenkle等1967年报道的Pbmm空间群，因为Pbmm空间群不允许上述反对称交换作用。
Several reports of electron paramagnetic resonance experiments performed on the spin - Peierls compound have appeared so far, but none of them have precisely explained the origin of the line broadening and the temperature dependence of both the linewidth and the resonance field, all of which differ from those of conventional one-dimensional Heisenberg antiferromagnets in which the dipolar or anisotropic exchange interaction brings about line broadening. In the present report, it is clarified that the antisymmetric exchange interaction, with -axis (magnetic chain), between nearest-neighbour Cu spins on the c-axis governs all factors which characterize the EPR line of , i.e., the value and the angular dependence of the linewidth at high temperatures where the short-range order is completely absent, the temperature dependence of the linewidth, and the resonance field, as well as the high-temperature lineshape. The present conclusion indicates that the crystal symmetry of this compound is lower than that given by the space group Pbmm which was reported by Vollenkle et al in 1967, because the symmetry Pbmm does not allow the antisymmetric exchange interaction mentioned above.