Anisotropic, Intermediate Coupling Superconductivity in Cu0.03TaS2

Details Anisotropic, Intermediate Coupling Superconductivity in Cu0.03TaS2 Anisotropic, Intermediate Coupling Superconductivity in Cu0.03TaS2

2008-11-21

arxiv.org/abs/0811.3466v3

J. Phys.: Condens. Matter 21 (2009) 145701

Physics

Condensed Matter

Superconductivity

16pages, 5figures

Scientific paper

10.1088/0953-8984/21/14/145701

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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