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Anisotropic, Intermediate Coupling Superconductivity in Cu0.03TaS2

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arxiv 0811.3466 v3 pith:7MABD4O4 submitted 2008-11-21 cond-mat.supr-con

X. D. Zhu , Y. P. Sun , S. H. Zhang , J. L. Wang , L. J. Zou , L. E. Delong , G. Cao , X. B. Zhu
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X. Luo B. S. Wang G. Li Z. R. Yang W. H. Song J. M. Dai
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classification cond-mat.supr-con
keywords tas2anisotropiccouplingsuperconductingheatintermediatespecificsuperconductivity
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The anisotropic superconducting state properties in Cu0.03TaS2 have been investigated by magnetization, magnetoresistance, and specific heat measurements. It clearly shows that Cu0.03TaS2 undergoes a superconducting transition at TC = 4.03 K. The obtained superconducting parameters demonstrate that Cu0.03TaS2 is an anisotropic type-II superconductor. Combining specific heat jump = 1.6(4), gap ratio 2/kBTC = 4.0(9) and the estimated electron-phonon coupling constant ~ 0.68, the superconductivity in Cu0.03TaS2 is explained within the intermediate coupling BCS scenario. First-principles electronic structure calculations suggest that copper intercalation of 2H-TaS2 causes a considerable increase of the Fermi surface volume and the carrier density, which suppresses the CDW fluctuation and favors the raise of TC.

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