Fully gapped superconductivity in centrosymmetric and noncentrosymmetric Re-B compounds probed with μ SR

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

Fully gapped superconductivity in centrosymmetric and noncentrosymmetric Re-B compounds probed with μ SR

S. Sharma, Arushi, K. Motla, J. Beare, M. Nugent, M. Pula, T. J. Munsie, A. D. Hillier, R. P. Singh, G. M. Luke

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10 Scopus citations

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).

Original language	English
Article number	104507
Journal	Physical Review B
Volume	103
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.103.104507
State	Published - Mar 11 2021
Externally published	Yes

Funding

We would like to thank B. S. Hitti, S. Dunsiger, and G. D. Morris for their assistance during the measurements. Work at McMaster was supported by the Natural Sciences and Engineering Research Council of Canada. R.P.S. acknowledges the Science and Engineering Research Board, Government of India, for the Core Research Grant No. CRG/2019/001028. Financial support from DSTFIST Project No. SR/FST/PSI-195/2014(C) is also thankfully acknowledged.

Funders	Funder number
DSTFIST	SR/FST/PSI-195/2014
Science and Engineering Research Board	CRG/2019/001028
Natural Sciences and Engineering Research Council of Canada

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title = "Fully gapped superconductivity in centrosymmetric and noncentrosymmetric Re-B compounds probed with μ SR",

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).",

author = "S. Sharma and Arushi and K. Motla and J. Beare and M. Nugent and M. Pula and Munsie, {T. J.} and Hillier, {A. D.} and Singh, {R. P.} and Luke, {G. M.}",

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AU - Sharma, S.

AU - Arushi,

AU - Motla, K.

AU - Beare, J.

AU - Nugent, M.

AU - Pula, M.

AU - Munsie, T. J.

AU - Hillier, A. D.

AU - Singh, R. P.

AU - Luke, G. M.

PY - 2021/3/11

Y1 - 2021/3/11

N2 - 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).

AB - 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).

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Fully gapped superconductivity in centrosymmetric and noncentrosymmetric Re-B compounds probed with μ SR

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