Nonlinear cyclotron resonance of rare-earth semimetals

M. Motokawa, M. Yoshida, K. Koyama
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Abstract

The cyclotron resonance is the best way to determine the effective masses of conductors and it is interesting to compare them with other effective masses determined by the de Haas oscillations. According to Kohn's theorem, they are not necessarily coincident with each other because an electron-electron correlation in the strongly correlated electron systems contributes to only the case of the de Haas oscillations. This argument has been studied in the case of organic conductors. On the other hand, it has been difficult to observe the cyclotron resonance absorption in rare-earth semimetals due to necessity of high frequency equipment, high magnetic field, very low temperature and high quality specimen. We have succeeded in observing cyclotron resonance in some rare-earth monopnictide compounds RX (R=rare earth atom, X=pnictgen atom) with NaCl type crystal structure and discussed the relationship between two kinds of masses of these materials. As reference materials, nonmagnetic LaSb and PrSb were also studied. In these cases, we have found new nonlinear resonance lines in addition to the normal cyclotron resonance whose resonance frequencies are linear with respect to magnetic field intensity. We ascribe this effect to the Doppler shift caused by coupling of cyclotron motion of carriers with the Alfven wave propagating in the material.
稀土半金属的非线性回旋共振
回旋共振是确定导体有效质量的最好方法,将它们与由德哈斯振荡确定的其他有效质量进行比较是很有趣的。根据Kohn定理,它们并不一定是重合的,因为在强相关电子系统中,电子与电子的关联只对de Haas振荡有贡献。这个论点已经在有机导体的情况下得到了研究。另一方面,由于需要高频设备、高磁场、极低温度和高质量的样品,对稀土半金属中的回旋共振吸收的观测一直很困难。我们成功地观察到了一些具有NaCl型晶体结构的稀土单核苷酸化合物RX (R=稀土原子,X= pnicn原子)的回旋共振,并讨论了这些材料的两种质量之间的关系。非磁性LaSb和PrSb作为对照物质也进行了研究。在这些情况下,我们发现了除了共振频率与磁场强度成线性关系的普通回旋加速器共振之外的新的非线性共振线。我们将这种效应归因于载流子的回旋运动与在材料中传播的阿尔芬波耦合所引起的多普勒频移。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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