Anomalous superconducting state in LiFeAs implied by the 75As Knight shift measurement

被引：18

作者：

Baek, S-H ^{[1
]}

Harnagea, L. ^{[1
]}

Wurmehl, S. ^{[1
]}

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

Grafe, H-J ^{[1
]}

机构：

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

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

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2013年 / 25卷 / 16期

关键词：

SINGLE-CRYSTAL GROWTH;

D O I：

10.1088/0953-8984/25/16/162204

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

As-75 NMR investigation of a single crystal of superconducting LiFeAs is presented. The Knight shift and the in situ ac susceptibility measurements as a function of temperature and external field are indicative of two superconducting (SC) transition temperatures, each of which is associated with its own upper critical field. Strikingly, the Knight shift maintains its normal state value over a temperature range in the SC state before it drops abruptly, being consistent with spin-singlet pairing. Together with our previous NMR study, the anomalous SC state featuring the constant Knight shift is attributed to the extremely sensitive SC properties of LiFeAs, probably stemming from its proximity to a critical instability.

引用

页数：5

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