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Enhanced Superconductivity and Structural Phase Transition in the Solid Solution Rh1-xPtxSb
Akira Iyo1, Hiroshi Fujihisa1, Izumi Hase1
1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan.
Abstract:
The solid solution Rh1-xPtxSb, bridging the structurally distinct MnP-type RhSb and NiAs-type PtSb, was systematically investigated. A temperature-induced structural phase transition between the MnP- and NiAs-type phases occurs at x ≈ 0.1 near room temperature, accompanied by pronounced resistivity hysteresis. Superconductivity emerges for x ≥ 0.2, and the critical temperature (Tc) reaches a maximum value of 4.25 K at x = 0.4─the highest Tc among transition-metal monoantimonides. The electron-phonon coupling constant (λep ≈ 0.6) and normalized specific-heat jump (ΔCel/γTc ≈ 1.6) classify Rh1-xPtxSb as a weak-coupling superconductor. The compositional dependence of both the Debye temperature (ΘD) and the electronic density of states at the Fermi level (N(EF)) correlates closely with Tc, suggesting that they are responsible for the Tc enhancement. A comparison with the high-entropy analogue M1-xPtxSb (M = equimolar Ru, Rh, Pd, and Ir) revealed distinct differences in ΘD and N(EF), which can account for the observed difference in Tc between the two systems.
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