Nodal quasiparticle dynamics in the heavy fermion superconductor CeCoIn5 revealed by precision microwave spectroscopy
Nodal quasiparticle dynamics in the heavy fermion superconductor CeCoIn5 revealed by precision microwave spectroscopy
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DOI：
10.1038/ncomms3477
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发表时间：
2013-09-01
影响因子：
16.6
通讯作者：
Broun, D. M.
中科院分区：
文献类型：
--
作者：
Truncik, C. J. S.;Huttema, W. A.;Broun, D. M.
CeCoIn5 是一种重费米子超导体，与高温铜酸盐具有很强的相似性，包括准二维性、接近反铁磁性以及由非费米液体正常态产生的可能的 d 波配对。详细比较它们的电子特性的实验特别令人感兴趣，但在大多数情况下很难实现，因为它们的转变温度非常不同。在这里，我们使用低温微波光谱来研究 CeCoIn5 超导态的电荷动力学。与铜酸盐，特别是与超净 YBa2Cu3Oy 的相似之处是惊人的：准粒子电导率的频率和温度依赖性是立即可识别的，这是在 T-c 以下快速抑制准粒子散射的结果；和穿透深度数据，如果处理得当，揭示了准粒子对超流体密度的贡献的清晰、线性的温度依赖性。测量结果还揭示了关键的差异，包括显着的多带效应和准粒子质量的温度依赖性重正化。
CeCoIn5 is a heavy fermion superconductor with strong similarities to the high-T-c cuprates, including quasi-two-dimensionality, proximity to antiferromagnetism and probable d-wave pairing arising from a non-Fermi-liquid normal state. Experiments allowing detailed comparisons of their electronic properties are of particular interest, but in most cases are difficult to realize, due to their very different transition temperatures. Here we use low-temperature microwave spectroscopy to study the charge dynamics of the CeCoIn5 superconducting state. The similarities to cuprates, in particular to ultra-clean YBa2Cu3Oy, are striking: the frequency and temperature dependence of the quasiparticle conductivity are instantly recognizable, a consequence of rapid suppression of quasiparticle scattering below T-c; and penetration-depth data, when properly treated, reveal a clean, linear temperature dependence of the quasiparticle contribution to superfluid density. The measurements also expose key differences, including prominent multiband effects and a temperature-dependent renormalization of the quasiparticle mass.