Superconductivity in the cobalt-doped V₃Si A15 intermetallic compound

Abstract

The A15 structure of superconductors is a prototypical type-II superconductor that has generated considerable interest since the early history of superconducting materials. This paper discusses the superconducting properties of previously unreported V3-xCoxSi (0 ≤ x ≤ 0.30) alloys. It is found that the lattice parameter decreases with increasing cobalt-doped content and leads to an increased residual resistivity ratio (RRR) value of the V3-xCoxSi system. Meanwhile, the superconducting transition temperature (Tc) cobalt-doped content. Furthermore, the fitted data show that the increase of cobalt-doped content also reduces the lower/upper critical fields of the V3-xCoxSi system. Type-II superconductivity is demonstrated on all V3-xCoxSi samples. With higher Co-doped content, V3-xCoxSi (0.15 ≤ x ≤ 0.30) alloys may have superconducting and structural phase transitions at low-temperature regions. As the electron/atom (e/a) ratio increases, the Tc variation trend of V3Si is as pronounced as in crystalline alloys and monotonically follows the trend observed for amorphous superconductors.

Low-frequency electron–phonon interaction and superconductivity in L12 -type trialuminides Al3V

“…Based on our calculation, the D0 22 -type Al 3 V does not possess superconductivity with or without compression. However, the L1 2 cubic polymorph (space group Pm 3m, 221) of Al 3 V exhibits robust superconductivity, which is surprisingly in good agreement with one of the Matthias rules: high symmetry is good, cubic symmetry is the best [30,[40][41][42][43][44][45].…”