Upper critical field in the organic superconductor β′-(ET)2SF5CH2CF2SO3: Possibility of Fulde-Ferrell-Larkin-Ovchinnikov state

被引：57

作者：

Cho, K. ^{[1
]}

Smith, B. E. ^{[1
]}

Coniglio, W. A. ^{[1
]}

Winter, L. E. ^{[1
]}

Agosta, C. C. ^{[1
]}

Schlueter, J. A. ^{[2
]}

机构：

[1] Clark Univ, Dept Phys, Worcester, MA 01610 USA

[2] Argonne Natl Lab, Div Chem & Mat Sci, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 22期

关键词：

mixed state; organic superconductors; superconducting critical field; superconducting transitions; BEDT-TTF; MAGNETIC-PROPERTIES; ELECTRON-SPIN; TEMPERATURE; HEAT;

D O I：

10.1103/PhysRevB.79.220507

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report upper critical-field measurements in the metal-free-all-organic superconductor beta(')-(ET)(2)SF5CH2CF2SO3 obtained from measuring the in-plane penetration depth using the tunnel diode oscillator technique. For magnetic field applied parallel to the conducting planes the low-temperature upper critical fields are found to exceed the Pauli limiting field calculated by using a semiempirical method. Furthermore, we found a signature that could be the phase transition between the superconducting vortex state and the Fulde-Ferrell-Larkin-Ovchinnikov state in the form of a kink just below the upper critical field and only at temperatures below 1.23 K.

引用

页数：4

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