Two distinct superconducting phases in LiFeAs

被引：16

作者：

Nag, P. K. ^{[1
]}

Schlegel, R. ^{[1
]}

Baumann, D. ^{[1
]}

Grafe, H. -J. ^{[1
]}

Beck, R. ^{[1
]}

Wurmehl, S. ^{[1
,2
]}

Buechner, B. ^{[1
,2
,3
]}

Hess, C. ^{[1
,3
]}

机构：

[1] Inst Solid State Res, IFW Dresden, D-01171 Dresden, Germany

[2] Tech Univ Dresden, Inst Solid State Phys, D-01069 Dresden, Germany

[3] Tech Univ Dresden, Ctr Transport & Devices, D-01069 Dresden, Germany

来源：

SCIENTIFIC REPORTS | 2016年 / 6卷

基金：

欧洲研究理事会;

关键词：

D O I：

10.1038/srep27926

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A non-trivial temperature evolution of superconductivity including a temperature-induced phase transition between two superconducting phases or even a time-reversal symmetry breaking order parameter is in principle expected in multiband superconductors such as iron-pnictides. Here we present scanning tunnelling spectroscopy data of LiFeAs which reveal two distinct superconducting phases: at T-c* = 18 K a partial superconducting gap opens, evidenced by subtle, yet clear features in the tunnelling spectra, i.e. particle-hole symmetric coherence peak and dip-hump structures. At T-c = 16 K, these features substantiate dramatically and become characteristic of full superconductivity. Remarkably, the distance between the dip-hump structures and the coherence peaks remains practically constant in the whole temperature regimeT <= T-c*. This rules out the connection of the dip-hump structures to an antiferromagnetic spin resonance.

引用

页数：7

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