Fully gapped superconductivity in centrosymmetric and noncentrosymmetric Re-B compounds probed with μSR
S. Sharma, Arushi, K. Motla, J. Beare, M. Nugent, M. Pula, T. J. Munsie, A. D. Hillier, R. P. Singh, G. M. Luke
DOI 10.1103/PhysRevB.103.104507 · Physical Review B
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Abstract
We present a comprehensive study on the superconducting properties of Re7B3 and Re3B through specific heat, magnetic susceptibility, resistivity, and transverse and zero-field muon spin rotation/relaxation (μSR) experiments on polycrystalline samples. Re7B3 (TC = 3.2 K) is a noncentrosymmetric type-II (κ≃ 9.27) superconductor in the weak-coupling (λe−ph = 0.54) regime. On the other hand, Re3B (TC = 5.19 K) is a centrosymmetric type-II (κ≃ 34.55) superconductor in the moderate-coupling (λe−ph = 0.64) regime. Our transverse-field μSR measurements show evidence for isotropically gapped BCS-type superconductivity with normalized gap (Δ0/kBTC) values of 1.69 (Re7B3) and 1.75 (Re3B).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Re7B3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.2 | Pressure not reported | onset |
| Re7B3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.3 | Pressure not reported | midpoint |
| Re3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.19 | Pressure not reported | onset |
| Re3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure not reported | midpoint |
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