Lifshitz相变和变磁性：CeRu $_2$ Si $_2$的热电研究
Lifshitz Transition and Metamagnetism: Thermoelectric Studies of CeRu$_2$Si$_2$
摘要：
我们报告了CeRu $_2$ Si $_2$中赝变磁转变（MMT）的热电功率（TEP）随磁场和温度的变化。我们施加热电梯度平行和垂直于场沿c轴的四方晶体，这是易磁化轴。在H $_m$ =7.8 T的MMT下，对于具有相反符号的两种配置，观察到TEP中的强烈异常。在Hm的异常成为一个级联的异常在非常低的温度下，这似乎是一个通用的功能TEP的费米面（FS）在重费米子多带系统的拓扑结构的变化。同时，量子振荡的磁场依赖性的TEP观察到以下和以上的MMT的配置。
英文摘要：
We report field and temperature dependent measurements of the thermoelectric power (TEP) across the pseudo-metamagnetic transition (MMT) in CeRu$_2$Si$_2$. We applied the thermoelectric gradient parallel and perpendicular to the field along the c axis of the tetragonal crystal which is the easy magnetization axis. At the MMT at H$_m$=7.8 T, a strong anomaly in the TEP is observed for both configurations with opposite signs. The anomaly at Hm becomes a cascade of anomalies at very low temperature which seems to be a generic feature of the TEP at a change in the topology of the Fermi surface (FS) in heavy Fermion multiband systems. Simultaneously, quantum oscillations in the magnetic field dependence of the TEP are observed for both configurations below and above the MMT.
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