Unconventional properties of the noncentrosymmetric superconductor Re8NbTa

R. K. Kushwaha; Arushi; S. Sharma; S. Srivastava; P. K. Meena; M. Pula; J. Beare; J. Gautreau; A. D. Hillier; G. M. Luke; R. P. Singh

doi:10.1103/PhysRevB.109.174518

Unconventional properties of the noncentrosymmetric superconductor Re8NbTa

R. K. Kushwaha, Arushi, S. Sharma, S. Srivastava, P. K. Meena, M. Pula, J. Beare, J. Gautreau, A. D. Hillier, G. M. Luke, R. P. Singh

Single Crystal Diffraction

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Abstract

Re-based superconductors provide a rich platform for the study of unconventional superconductivity. We have investigated the superconducting properties of Re8NbTa, a new noncentrosymmetric cubic (α-Mn structure) rhenium-based ternary superconductor using transport, magnetization, specific-heat, and muon-spin rotation/relaxation (μSR) measurements. Specific-heat and transverse field μSR measurements suggest moderately coupled fully gapped superconductivity, well described by BCS theory. However, our zero-field μSR measurements reveal a small internal field onsetting around the superconducting Tc, indicating the unconventional superconducting ground state.

Original language	English
Article number	174518
Journal	Physical Review B
Volume	109
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.109.174518
State	Published - May 1 2024

Funding

R.K.K. acknowledges the UGC Government of India for the Senior Research Fellowship (SRF). R.P.S. thanks Science and Engineering Board (SERB), Government of India, for the Core Research Grant No. CRG/2023/000817. Work at McMaster University received support from Natural Sciences and Engineering Research Council of Canada (NSERC).

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abstract = "Re-based superconductors provide a rich platform for the study of unconventional superconductivity. We have investigated the superconducting properties of Re8NbTa, a new noncentrosymmetric cubic (α-Mn structure) rhenium-based ternary superconductor using transport, magnetization, specific-heat, and muon-spin rotation/relaxation (μSR) measurements. Specific-heat and transverse field μSR measurements suggest moderately coupled fully gapped superconductivity, well described by BCS theory. However, our zero-field μSR measurements reveal a small internal field onsetting around the superconducting Tc, indicating the unconventional superconducting ground state.",

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AU - Pula, M.

AU - Beare, J.

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AU - Hillier, A. D.

AU - Luke, G. M.

AU - Singh, R. P.

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AB - Re-based superconductors provide a rich platform for the study of unconventional superconductivity. We have investigated the superconducting properties of Re8NbTa, a new noncentrosymmetric cubic (α-Mn structure) rhenium-based ternary superconductor using transport, magnetization, specific-heat, and muon-spin rotation/relaxation (μSR) measurements. Specific-heat and transverse field μSR measurements suggest moderately coupled fully gapped superconductivity, well described by BCS theory. However, our zero-field μSR measurements reveal a small internal field onsetting around the superconducting Tc, indicating the unconventional superconducting ground state.

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Unconventional properties of the noncentrosymmetric superconductor Re8NbTa

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