Dynamics of heavy fermions: Drude response in UPd2Al3UPd2Al3 and UNi2Al3UNi2Al3
Dynamics of heavy fermions: Drude response in UPd2Al3UPd2Al3 and UNi2Al3UNi2Al3
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重费米子动力学：UPd2Al3UPd2Al3 和 UNi2Al3UNi2Al3 中的德鲁德响应
DOI：
10.1016/j.physb.2006.01.381
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发表时间：
2006
影响因子：
2.8
通讯作者：
H. Adrian
中科院分区：
文献类型：
--
作者：
M. Scheffler;M. Dressel;M. Jourdan;H. Adrian
虽然重费米子的有效质量决定了它们的热力学，但光学特性却由特征弛豫率决定，而特征弛豫率预计与有效质量成反比。在弛豫率明显的特征下，复电导率的实部和虚部发生所谓的德鲁德响应。传统的光谱只能间接探测德鲁德响应；因此，我们使用新颖的宽带微波光谱法直接测量相关频率范围内 UPd{sub 2}Al{sub 3} 和 UNi{sub 2}Al{sub 3} 的频率相关电导率，并明确观察重费米子的完整低能电动力学，包括德鲁德响应，我们发现弛豫率远低于之前确定的其他重费米子化合物。
While the effective mass of heavy fermions governs their thermodynamics, the optical properties are dominated by the characteristic relaxation rate which is expected to scale inversely with the effective mass. At the relaxation rate clear features, the so-called Drude response occur in the real and imaginary parts of the complex conductivity. Conventional optical spectroscopy can only indirectly probe the Drude response; thus we use novel broadband microwave spectroscopy to directly measure the frequency-dependent conductivity of UPd{sub 2}Al{sub 3} and UNi{sub 2}Al{sub 3} in the relevant frequency range and unambiguously observe the full low-energy electrodynamics of the heavy fermions including the Drude response, and we find a relaxation rate much lower than previously determined for other heavy-fermion compounds.