Anisotropic, Intermediate Coupling Superconductivity in Cu0.03TaS2

Abstract

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.

16pages, 5figures

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• Superconductivity and charge-density wave formation in lithium intercalated 2H-LixTaS2
• Possible charge-density-wave signatures in the anomalous resistivity of Li-intercalated multilayer MoS2
• Enhanced anisotropic superconductivity in the topological nodal-line semimetal InxTaS2
• Quasi-two-dimensional anisotropic superconductivity in Li intercalated 2H-TaS${}_2$
• Enhanced Superconductivity in 2H-TaS2 Devices Through in-situ Molecular Intercalation
• Vortex Phase Diagram of Layered Superconductor Cu0.03TaS2 for H || c
• Breaking the Trade-off: Bulk 2D Ising Superconductivity with High Tc and Giant Interlayer Spacing via a Unique Chain Intercalation in (BaS)1/3TaS2