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J. Phys. Soc. Jpn. 79 (2010) 053703 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Evidence for Anisotropic Vortex Dynamics and Pauli Limitation in the Upper Critical Field of FeSe1-xTex

Daniel Braithwaite, Gérard Lapertot, William Knafo1, and Ilya Sheikin2

SPSMS, UMR-E 9001, CEA-INAC/UJF-Grenoble 1, 17 rue des martyrs, 38054 Grenoble, France
1LNCMI, UPR 3228, CNRS-UJF-UPS-INSA, 31400 Toulouse, France
2LNCMI, UPR 3228, CNRS-UJF-UPS-INSA, 38042 Grenoble, France

(Received February 20, 2010; Accepted March 19, 2010; Published April 26, 2010)

We have determined HC2(T) for FeSe1-xTex (x=0.52) single crystals using resistivity measurements at high static and pulsed magnetic field, as well as specific heat measurements up to 9 T. We find that the significant anisotropy of the initial slope of HC2(T) determined from resistivity measurements, is not present when HC2 is determined from the specific heat results. This suggests that the thermodynamic upper critical field is almost isotropic, and that anisotropic vortex dynamics play a role. Further evidence of anisotropic vortex dynamics is found in the behaviour in pulsed field. We also find that Pauli limiting must be included in order to fit the temperature dependence of HC2, indicating probably higher effective mass in FeSe1-xTex than in other Fe superconductors. ©2010 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/79/053703/
DOI: 10.1143/JPSJ.79.053703


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