Possible indicators for low dimensional superconductivity in the quasi-1D carbide Sc3CoC4

作者：E.-W. Scheidt, Chrıstoph Hauf, Florian Reiner, Georg Eickerling, Wolfgang Scherer · 发表于：Journal of Physics Conference Series · 年份：2011 · DOI：10.1088/1742-6596/273/1/012083 · 被引用次数：17 · 研究领域：Inorganic Chemistry and Materials、Rare-earth and actinide compounds、Iron-based superconductors research

The transition metal carbide Sc 3 CoC 4 consists of a quasi-one-dimensional (1D) structure with [CoC 4 ] ∞ polyanionic chains embedded in a scandium matrix. At ambient temperatures Sc 3 CoC 4 displays metallic behavior. At lower temperatures, however, charge density wave formation has been observed around 143 K which is followed by a structural phase transition at 72 K. Below T c onset = 4.5 K the polycrystalline sample becomes superconductive. From H c1 (0) and H c2 (0) values we could estimate the London penetration depth (λ L ≊ 9750 Å) and the Ginsburg-Landau (GL) coherence length (ξ GL ≊ 187 Å). The resulting GL-parameter (κ ≊ 52) classifies Sc 3 CoC 4 as a type II superconductor. Here we compare the puzzling superconducting features of Sc 3 CoC 4 , such as the unusual temperature dependence i) of the specific heat anomaly and ii) of the upper critical field H c 2 (T) at T c , and iii) the magnetic hysteresis curve, with various related low dimensional superconductors: e.g., the quasi-1D superconductor (SN) x or the 2D transition-metal dichalcogenides. Our results identify Sc 3 CoC 4 as a new candidate for a quasi-1D superconductor.