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首页> 外文期刊>Physica status solidi, B. Basic research >Microwave spectroscopy on heavy-fermion systems: Probing the dynamics of charges and magnetic moments
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Microwave spectroscopy on heavy-fermion systems: Probing the dynamics of charges and magnetic moments

机译：重费米子系统上的微波光谱：探测电荷和磁矩的动力学

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Investigating solids with light gives direct access to charge dynamics, electronic and magnetic excitations. For heavy fermions, one has to adjust the frequency of the probing light to the small characteristic energy scales, leading to spectroscopy with microwaves. We review general concepts of the frequency-dependent conductivity of heavy fermions, including the slow Drude relaxation and the transition to a superconducting state, which we also demonstrate with experimental data taken on UPd_2Al_3. We discuss the optical response of a Fermi liquid and how it might be observed in heavy fermions. Microwave studies with focus on quantum criticality in heavy fermions concern the charge response, but also the magnetic moments can be addressed via electron spin resonance (ESR). We discuss the case of YbRh_2Si_2, the open questions concerning ESR of heavy fermions, and how these might be addressed in the future. This includes an overview of the presently available experimental techniques for microwave studies on heavy fermions, with a focus on broadband studies using the Corbino approach and on planar superconducting resonators.
机译：用光研究固体可以直接获得电荷动力学，电子和磁激发。对于重费米子，必须将探测光的频率调整到较小的特征能级，从而导致使用微波进行光谱分析。我们回顾了重费米子随频率变化的电导率的一般概念，包括缓慢的Drude弛豫和过渡到超导状态，并用在UPd_2Al_3上获得的实验数据进行了证明。我们讨论了费米液体的光学响应以及如何在重费米子中观察到它。专注于重费米子的量子临界的微波研究涉及电荷响应，但是磁矩也可以通过电子自旋共振（ESR）解决。我们讨论了YbRh_2Si_2的情况，有关重费米ESR的悬而未决的问题以及将来如何解决这些问题。其中概述了目前可用于重铁离子微波研究的实验技术，重点是使用Corbino方法进行宽带研究以及平面超导谐振器。

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