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The anisotropic superconducting state properties in Cu0.03TaS2 have beeninvestigated by magnetization, magnetoresistance, and specific heatmeasurements. It clearly shows that Cu0.03TaS2 undergoes a superconductingtransition at TC = 4.03 K. The obtained superconducting parameters demonstratethat Cu0.03TaS2 is an anisotropic type-II superconductor. Combining specificheat jump = 1.6(4), gap ratio 2/kBTC = 4.0(9) and the estimated electron-phononcoupling constant ~ 0.68, the superconductivity in Cu0.03TaS2 is explainedwithin the intermediate coupling BCS scenario. First-principles electronicstructure calculations suggest that copper intercalation of 2H-TaS2 causes aconsiderable increase of the Fermi surface volume and the carrier density,which suppresses the CDW fluctuation and favors the raise of TC.

Anisotropic, Intermediate Coupling Superconductivity in Cu0.03TaS2