Phase Diagrams of the Reentrant Superconducting Re(1)1?xRe(2)xX (X = Rh4B4) Alloys.Application to Er1?xHoxX, Er1?xGdxX, Er1?xTmxX, HoxLu1?xX and Sm1?xErxX

Abstract

We consider a simplified version of the s–f model, supplemented by the intersite Cooper pair interaction between conduction electrons with opposite spins to investigate the ferromagnetic and superconducting properties of an alloy Re1‐x(1)Re(2)xX (Re(1), Re(2) rare earth elements, X = Rh4B4) using the virtual crystal approximation (VCA). For a suitable choice of the model parameters we can reproduce the phase boundaries of the experimentally measured phase diagrams for Er1—xHoxX, Er1—xGdxX, Er1—xTmxX, HoxLu1—xX and Sm1—xErxX alloys.