|Title:||Enhancing superconductivity of the nonmagnetic quasiskutterudites by atomic disorder|
Maśka, Maciej M.
|Keywords:||skutterudite-related superconductors; superconductivity; BCS theory; atomic disorder|
|Citation:||"Materials" (2020), iss. 24, art. no. 5830, s. 1-17|
|Abstract:||We investigated the effect of enhancement of superconducting transition temperature Tc by nonmagnetic atom disorder in the series of filled skutterudite-related compounds (La3M4Sn13, Ca3Rh4Sn13, Y5Rh6Sn18, Lu5Rh6Sn18; M = Co, Ru, Rh), where the atomic disorder is generated by various defects or doping. We have shown that the disorder on the coherence length scale x in these nonmagnetic quasiskutterudite superconductors additionally generates a non-homogeneous, high-temperature superconducting phase with T? c > Tc (dilute disorder scenario), while the strong fluctuations of stoichiometry due to increasing doping can rapidly increase the superconducting transition temperature of the sample even to the value of T? c 2Tc (dense disorder leading to strong inhomogeneity). This phenomenon seems to be characteristic of high-temperature superconductors and superconducting heavy fermions, and recently have received renewed attention. We experimentally documented the stronger lattice stiffening of the inhomogeneous superconducting phase T? c in respect to the bulk Tc one and proposed a model that explains the T? c > Tc behavior in the series of nonmagnetic skutterudite-related compounds.|
|Appears in Collections:||Artykuły (WNŚiT)|
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