title: 1D to 3D dimensional crossover in the superconducting transition of the quasi-one-dimensional carbide superconductor Sc3CoC4.
abstract: The transition metal carbide superconductor Sc(3)CoC(4) may represent a new benchmark system of quasi-one-dimensional (quasi-1D) superconducting behavior. We investigate the superconducting transition of a high-quality single crystalline sample by electrical transport experiments. Our data show that the superconductor goes through a complex dimensional crossover below the onset T(c) of 4.5 K. First, a quasi-1D fluctuating superconducting state with finite resistance forms in the [CoC(4)](∞) ribbons which are embedded in a Sc matrix in this material. At lower temperature, the transversal Josephson or proximity coupling of neighboring ribbons establishes a 3D bulk superconducting state. This dimensional crossover is very similar to Tl(2)Mo(6)Se(6), which for a long time has been regarded as the most appropriate model system of a quasi-1D superconductor. Sc(3)CoC(4) appears to be even more in the 1D limit than Tl(2)Mo(6)Se(6).
authors: Department of Physics and the William Mong Institute of Nano Science and Technology, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors: Mingquan
authors: M
authors: He
authors: Chi Ho
authors: CH
authors: Wong
authors: Dian
authors: D
authors: Shi
authors: Pok Lam
authors: PL
authors: Tse
authors: Ernst-Wilhelm
authors: EW
authors: Scheidt
authors: Georg
authors: G
authors: Eickerling
authors: Wolfgang
authors: W
authors: Scherer
authors: Ping
authors: P
authors: Sheng
authors: Rolf
authors: R
authors: Lortz