Probing the superconducting ground state of noncentrosymmetric high-entropy alloys using muon-spin rotation and relaxation
Kapil Motla, Arushi, P. K. Meena, D. Singh, P. K. Biswas, A. D. Hillier, R. P. Singh
DOI 10.1103/PhysRevB.104.094515 · Physical Review B
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Abstract
Recently, high-entropy alloys (HEAs) have emerged as a unique platform for discovering superconducting materials and offer avenues to explore exotic superconductivity. The highly disordered nature of HEAs suggests the regular phonon required for BCS superconductivity may be unlikely to occur. Therefore, understanding the microscopic properties of these superconducting HEAs is important. We report a detailed characterization of the superconducting properties of the noncentrosymmetric (α−Mn structure) HEAs (HfNb)0.10(MoReRu)0.90 and (ZrNb)0.10(MoReRu)0.90 by using magnetization, specific heat, AC transport, and muon-spin relaxation/rotation (μSR). Despite the disordered nature, low-temperature specific heat and transverse-field muon spin rotation measurements suggest a nodeless isotropic superconducting gap, and zero-field μSR measurements confirm that time reversal symmetry is preserved in the superconducting ground state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (HfNb)0.10(MoReRu)0.90 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.9 | Pressure not reported | midpoint |
| (HfNb)0.10(MoReRu)0.90 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.2 | Pressure not reported | onset |
| (ZrNb)0.10(MoReRu)0.90 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.8 | Pressure not reported | midpoint |
| (ZrNb)0.10(MoReRu)0.90 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.5 | Pressure not reported | onset |
| Ta34Nb33Hf8Zr14Ti11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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