Optical conductivity evidence of clean-limit superconductivity in LiFeAs

被引：9

作者：

Lobo, R. P. S. M. ^{[1
,2
,3
,4
]}

Chanda, G. ^{[5
,6
]}

Pronin, A. V. ^{[5
,7
,8
]}

Wosnitza, J. ^{[5
,6
]}

Kasahara, S. ^{[9
]}

Shibauchi, T. ^{[9
,10
]}

Matsuda, Y. ^{[9
]}

机构：

[1] PSL Res Univ, ESPCI ParisTech, F-75231 Paris 5, France

[2] CNRS, UMR 8213, F-75231 Paris 5, France

[3] Univ Paris 06, Sorbonne Univ, F-75231 Paris 5, France

[4] LPEM, F-75231 Paris 5, France

[5] Helmholtz Zentrum Dresden Rossendorf, Dresden High Magnet Field Lab HLD EMFL, D-01314 Dresden, Germany

[6] Tech Univ Dresden, Inst Festkorperphys, D-01062 Dresden, Germany

[7] Russian Acad Sci, AM Prokhorov Inst Gen Phys, Moscow 119991, Russia

[8] Univ Stuttgart, Inst Phys 1, D-70550 Stuttgart, Germany

[9] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[10] Univ Tokyo, Dept Adv Mat Sci, Chiba 2778561, Japan

来源：

PHYSICAL REVIEW B | 2015年 / 91卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.91.174509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We measured the optical conductivity of superconducting LiFeAs. In the superconducting state, the formation of the condensate leads to a spectral-weight loss and yields a penetration depth of 225 nm. No sharp signature of the superconducting gap is observed. This suggests that the system is likely in the clean limit. A Drude-Lorentz parametrization of the data in the normal state reveals a quasiparticle scattering rate supportive of spin fluctuations and proximity to a quantum critical point.

引用

页数：5

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