title: Anisotropic intermediate coupling superconductivity in Cu(0.03)TaS(2).
abstract: The anisotropic superconducting state properties in Cu(0.03)TaS(2) have been investigated by magnetization, magnetoresistance and specific heat measurements. They clearly show that Cu(0.03)TaS(2) undergoes a superconducting transition at T(C) = 4.03 K. The obtained superconducting parameters demonstrate that Cu(0.03)TaS(2) is an anisotropic type-II superconductor. Combining specific heat jump ΔC/γ(n)T(C) = 1.6(4), gap ratio 2Δ/k(B)T(C) = 4.0(9) and the estimated electron-phonon coupling constant λ∼0.68, the superconductivity in Cu(0.03)TaS(2) is explained within the intermediate coupling BCS scenario. First-principles electronic structure calculations suggest that copper intercalation of 2H-TaS(2) causes a considerable increase of the Fermi surface volume and the carrier density, which suppresses the CDW fluctuation and favors the raise of T(C).
authors.affiliation: Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
authors.forename: Xiangde
authors.initials: X
authors.lastname: Zhu
authors.forename: Yuping
authors.initials: Y
authors.lastname: Sun
authors.forename: Shuhua
authors.initials: S
authors.lastname: Zhang
authors.forename: Jianglong
authors.initials: J
authors.lastname: Wang
authors.forename: Liangjian
authors.initials: L
authors.lastname: Zou
authors.forename: Lance E
authors.initials: LE
authors.lastname: Delong
authors.forename: Xuebin
authors.initials: X
authors.lastname: Zhu
authors.forename: Xuan
authors.initials: X
authors.lastname: Luo
authors.forename: Bosen
authors.initials: B
authors.lastname: Wang
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.forename: Zhaorong
authors.initials: Z
authors.lastname: Yang
authors.forename: Wenhai
authors.initials: W
authors.lastname: Song