Microwave spectroscopy on heavy‐fermion systems: Probing the dynamics of charges and magnetic moments

Microwave spectroscopy on heavy‐fermion systems: Probing the dynamics of charges and magnetic moments
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重费米子系统的微波光谱:探测电荷和磁矩的动力学

DOI:
10.1002/pssb.201200925
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发表时间:
2013
期刊:
physica status solidi (b)
影响因子:
--
通讯作者:
Frank Steglich
Frank Steglich
中科院分区:
--
文献类型:
--
作者:
Marc Scheffler;Katrin Schlegel;Conrad Clauss;Daniel Hafner;Christian Fella;Martin Dressel;Martin Jourdan;Jörg Sichelschmidt;Cornelius Krellner;Christoph Geibel;Frank Steglich

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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,人们必须将探测光的频率调整到小的特征能量尺度,从而导致微波光谱学。我们回顾了重费米子的频率依赖电导率的一般概念,包括缓慢的Drude弛豫和向超导态的转变,我们也用UPd2Al3的实验数据证明了这一点。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。微波研究的重点是重费米子中的量子临界性,涉及电荷响应,但磁矩也可以通过电子自旋共振(ESR)来解决。我们讨论的情况下,YbRh2Si2,有关ESR的重费米子的开放问题,以及如何在未来这些可能会得到解决。其中包括对目前可用的重费米子微波研究实验技术的概述,重点是使用科尔比诺方法和平面超导谐振器的宽带研究。
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 UPd2Al3. 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 YbRh2Si2, 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.
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