Uniform electronic states and s-wave superconductivity in a strongly disordered high-entropy compound X0.6Pt0.4Sb (X = Ru, Rh, Pd, Ir)
Yufu Yamada, Shunsaku Kitagawa, Taishi Ihara, Kenji Ishida, Naoto Uematsu, Daigorou Hirai, Koshi Takenaka
DOI 10.1103/b4nw-c4zy · Physical Review B
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Abstract
High-entropy compounds, where multiple elements occupy a single crystallographic site in a highly disordered manner, challenge conventional understandings of electronic structures based on periodicity and well-defined band dispersion. Here, we report a detailed nuclear magnetic resonance study of the high-entropy superconductor X0.6Pt0.4Sb (X = Ru, Rh, Pd, Ir), revealing a spatially homogeneous electronic environment in the normal state, in stark contrast to its crystallographically disordered lattice. The superconducting state exhibits a small but solid Hebel-Slichter coherence peak followed by a significant decrease in the nuclear spin-lattice relaxation rate, providing compelling evidence for fully gapped s-wave pairing. Our findings not only deepen the understanding of superconductivity in highly disordered quantum materials but also open an alternative pathway for exploring superconducting states in entropy-stabilized systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| X0.6Pt0.4Sb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.1 | Pressure not reported | onset |
| PtSb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.1 | Pressure not reported | onset |
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