Specific heat in the mixed state of non-magnetic borocarbides

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• 作者：Lipp ; D. ; Drechsler ; S.-L. ; Freudenberger ; J. ; Fuchs ; G. ; Nenkov ; K. ; M&uuml ; ller ; K.-H. ; Schneider ; M. ; et. al.
• 关键词：Unconventional superconductivity ; Borocarbides ; Specific heat
• 刊名：Physica C
• 出版年：2003
• 期刊代码：80_09214534
• 类别：ms
• 出版时间：May, 2003
• 卷：388-389
• 期：Complete
• 页码：183-184
• 文件大小：160 K

摘要

The temperature and magnetic field dependence of the specific heat c_p(T,H) in the superconducting mixed state has been measured for polycrystalline Y_xLu_1−xNi₂B₂C and Y(Ni_1−yPt_y)₂B₂C samples. The deviations from the usual linear-in-H law of the linear-in-T electronic specific heat contribution γ(H)T can be possibly ascribed to unconventional pairing. The γ(H) dependence is discussed in the unitary d-wave scenario as well as in the intermediate transition region in between dirty and clean s-wave limits. From a consideration of γ(H) data, unconventional pairing cannot be ruled out.