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J. Phys. Soc. Jpn. 73 (2004) pp. 2065-2068  |Next Article|  |Table of Contents|
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Enhancement of Irreversibility Field in Carbon-substituted MgB2 Single Crystals

Eiji Ohmichi, Takahiko Masui1,2, Sergey Lee1, Setsuko Tajima1 and Toshihito Osada

Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581
1Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062
2Domestic Research Fellow, Japan Society for the Promotion of Science, Kawaguchi, Saitama 322-0012

(Received March 24, 2004)

We report on a detailed study of the irreversibility field Hirr of single crystals of Mg(B1-xCx)2 (x=0, 2, 3.5, 5 and 7.5%) in strong magnetic fields of up to 40 T. Highly sensitive torque measurements revealed that Hirr is greatly enhanced by a factor of two (µ0 Hirr(0) ≃33 T with x=5%) by carbon substitution compared with that of the pristine MgB2, owing to a reduction in in-plane coherence length. We also observed the temperature-dependent Hirr anisotropy for all carbon contents. This strongly suggests that the two-gap superconductivity of MgB2 is less influenced by a small amount of carbon substitution. We discuss these results by focusing on the impact of carrier doping and impurity scattering on a two-gap superconductor. ©2004 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/73/2065/
DOI: 10.1143/JPSJ.73.2065


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