Prediction of inorganic superconductors with quasi-one-dimensional crystal structure

Abstract

Models of superconductors having a quasi-one-dimensional crystal structure based on the convoluted into a tube Ginzburg sandwich, which comprises a layered dielectric-metal-dielectric structure, have been suggested. The critical crystal chemistry parameters of the Ginzburg sandwich determining the possibility of the emergence of superconductivity and the Т с value in layered high-T c cuprates, which could have the same functions in quasi-onedimensional fragments (sandwich-type tubes), have been examined. The crystal structures of known low-temperature superconductors, in which one can mark out similar quasi-one-dimensional fragments, have been analyzed. Five compounds with quasi-one-dimensional structures, which can be considered as potential parents of new superconductor families, possibly with high transition temperatures, have been suggested. The methods of doping and modification of these compounds are provided.

Superconductivity at 3.1 K in the orthorhombic ternary silicide ScRuSi

“…The temperature dependence of resistivity and magnetic susceptibility was measured for the h-ScRuSi samples above 1.8 K, with no superconductivity discovered, as shown in figure 6. The absence of superconductivity in h-ScRuSi is consistent with a previous half-empirical prediction [23]. The magnetic susceptibility was fitted by the Curie-Weiss formula: χ(T) = χ 0 + C/(T + θ) with χ 0 = 4.37 × 10 −4 emu mol −1 Oe −1 , C= 1.37×10 −3 emu K mol −1 Oe −1 and θ=3.36 K. The local moment was estimated to be ∼0.10μ B per formula where μ B is the Bohr magneton.…”

“…In fact, ScRuSi can crystallize in either the Co 2 P-type or the Fe 2 P-type phase according to our investigation, and is hereafter referred to as o-ScRuSi or h-ScRuSi, respectively. h-ScRuSi has a layered structure similar to that of superconducting hexagonal ZrRuSi, but it is predicted to be less likely to superconduct due to the extraordinarily long distance between its intra-layer Ru atoms [23]. Experimentally, neither of the two polymorphs of ScRuSi have been systematically examined for their low-temperature physical properties.…”