Strong Pauli-limiting behavior of Hc2 and uniaxial pressure dependencies in KFe2As2

被引：34

作者：

Burger, P. ^{[1
,2
]}

Hardy, F. ^{[1
]}

Aoki, D. ^{[3
,4
]}

Boehmer, A. E. ^{[1
,2
]}

Eder, R. ^{[1
]}

Heid, R. ^{[1
]}

Wolf, T. ^{[1
]}

Schweiss, P. ^{[1
]}

Fromknecht, R. ^{[1
]}

Jackson, M. J. ^{[5
,6
]}

Paulsen, C. ^{[5
,6
]}

Meingast, C. ^{[1
]}

机构：

[1] Karlsruher Inst Technol, Inst Festkorperphys, D-76021 Karlsruhe, Germany

[2] Karlsruher Inst Technol, Fak Phys, D-76131 Karlsruhe, Germany

[3] CEA Grenoble, SPSMS, INAC, F-38054 Grenoble, France

[4] Tohoku Univ, IMR, Oarai, Ibaraki 3111313, Japan

[5] CNRS, Inst Neel, F-38042 Grenoble 9, France

[6] Univ Grenoble 1, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 01期

关键词：

HIGH-TEMPERATURE SUPERCONDUCTIVITY; CRITICAL-FIELD; MAGNETIZATION; MAGNETISM; STATE;

D O I：

10.1103/PhysRevB.88.014517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

KFe2As2 single crystals are studied using specific-heat, high-resolution thermal-expansion, magnetization, and magnetostriction measurements. The magnetization and magnetostriction data provide clear evidence for strong Pauli-limiting effects of the upper critical field for magnetic fields parallel to the FeAs planes, suggesting that KFe2As2 may be a good candidate to search for the Fulde-Ferrell-Larkin-Ovchinnikov state. Using standard thermodynamic relations, the uniaxial pressure derivatives of the critical temperature T-c, the normal-state Sommerfeld coefficient gamma(n), the normal-state susceptibility chi, and the thermodynamic critical field H-c are calculated from our data. We find that the close relationship between doping and pressure as found in other Fe-based systems does not hold for KFe2As2.

引用

页数：8

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