Evidence for nonunitary triplet-pairing superconductivity in noncentrosymmetric TaRuSi and comparison with isostructural TaReSi

S. Sharma; Sajilesh Kp; A. D.S. Richards; J. Gautreau; M. Pula; J. Beare; K. M. Kojima; S. Yoon; Y. Cai; R. K. Kushwaha; T. Agarwal; E. S. Sørensen; R. P. Singh; G. M. Luke

doi:10.1103/PhysRevB.108.144510

Evidence for nonunitary triplet-pairing superconductivity in noncentrosymmetric TaRuSi and comparison with isostructural TaReSi

S. Sharma, Sajilesh Kp, A. D.S. Richards, J. Gautreau, M. Pula, J. Beare, K. M. Kojima, S. Yoon, Y. Cai, R. K. Kushwaha, T. Agarwal, E. S. Sørensen, R. P. Singh, G. M. Luke

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Abstract

We have studied the superconducting properties of the isostructural ternary noncentrosymmetric superconductors TaXSi (X=Re, Ru) with the help of muon spin rotation/relaxation (μSR) and density functional theory calculations. Our transverse-field μSR measurements indicate isotropic s-wave superconductivity in TaReSi and multigap superconductivity in TaRuSi. Zero-field μSR measurements, highly sensitive to very small magnetic fields, find no evidence of spontaneous fields in the superconducting state of TaReSi, whereas we observe small spontaneous fields that onset with superconductivity indicating broken time-reversal symmetry (TRS) superconductivity in TaRuSi. Using density functional theory calculations, we find that spin-orbit coupling is relatively weak in TaRuSi and strong in TaReSi. Using symmetry analysis, we attribute the broken TRS in TaRuSi to a nonunitary triplet pairing state. Such a state is not allowed in the presence of strong spin-orbit coupling: our finding of no evidence for broken TRS in TaReSi is consistent with this expectation.

Original language	English
Article number	144510
Journal	Physical Review B
Volume	108
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.108.144510
State	Published - Oct 1 2023
Externally published	Yes

Funding

Work at McMaster was supported by the Natural Sciences and Engineering Research of Council of Canada. R.P.S. acknowledges the Science and Engineering Research Board, Government of India, for Core Research Grant No. CRG/2019/001028. The financial support from DST-FIST (India) Project No. SR/FST/PSI-195/2014(C) is also thankfully acknowledged. This research was enabled in part by support provided by SHARCNET and the Digital Research Alliance of Canada .

Funders	Funder number
Natural Sciences and Engineering Research Council of Canada
Department of Science and Technology, Ministry of Science and Technology, India	SR/FST/PSI-195/2014
Science and Engineering Research Board	CRG/2019/001028
Alliance de recherche numérique du Canada
Shared Hierarchical Academic Research Computing Network

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10.1103/PhysRevB.108.144510

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Sharma, S., Kp, S., Richards, A. D. S., Gautreau, J., Pula, M., Beare, J., Kojima, K. M., Yoon, S., Cai, Y., Kushwaha, R. K., Agarwal, T., Sørensen, E. S., Singh, R. P., & Luke, G. M. (2023). Evidence for nonunitary triplet-pairing superconductivity in noncentrosymmetric TaRuSi and comparison with isostructural TaReSi. Physical Review B, 108(14), Article 144510. https://doi.org/10.1103/PhysRevB.108.144510

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title = "Evidence for nonunitary triplet-pairing superconductivity in noncentrosymmetric TaRuSi and comparison with isostructural TaReSi",

abstract = "We have studied the superconducting properties of the isostructural ternary noncentrosymmetric superconductors TaXSi (X=Re, Ru) with the help of muon spin rotation/relaxation (μSR) and density functional theory calculations. Our transverse-field μSR measurements indicate isotropic s-wave superconductivity in TaReSi and multigap superconductivity in TaRuSi. Zero-field μSR measurements, highly sensitive to very small magnetic fields, find no evidence of spontaneous fields in the superconducting state of TaReSi, whereas we observe small spontaneous fields that onset with superconductivity indicating broken time-reversal symmetry (TRS) superconductivity in TaRuSi. Using density functional theory calculations, we find that spin-orbit coupling is relatively weak in TaRuSi and strong in TaReSi. Using symmetry analysis, we attribute the broken TRS in TaRuSi to a nonunitary triplet pairing state. Such a state is not allowed in the presence of strong spin-orbit coupling: our finding of no evidence for broken TRS in TaReSi is consistent with this expectation.",

author = "S. Sharma and Sajilesh Kp and Richards, {A. D.S.} and J. Gautreau and M. Pula and J. Beare and Kojima, {K. M.} and S. Yoon and Y. Cai and Kushwaha, {R. K.} and T. Agarwal and S{\o}rensen, {E. S.} and Singh, {R. P.} and Luke, {G. M.}",

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Sharma, S, Kp, S, Richards, ADS, Gautreau, J, Pula, M, Beare, J, Kojima, KM, Yoon, S, Cai, Y, Kushwaha, RK, Agarwal, T, Sørensen, ES, Singh, RP & Luke, GM 2023, 'Evidence for nonunitary triplet-pairing superconductivity in noncentrosymmetric TaRuSi and comparison with isostructural TaReSi', Physical Review B, vol. 108, no. 14, 144510. https://doi.org/10.1103/PhysRevB.108.144510

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AU - Sharma, S.

AU - Kp, Sajilesh

AU - Richards, A. D.S.

AU - Gautreau, J.

AU - Pula, M.

AU - Beare, J.

AU - Kojima, K. M.

AU - Yoon, S.

AU - Cai, Y.

AU - Kushwaha, R. K.

AU - Agarwal, T.

AU - Sørensen, E. S.

AU - Singh, R. P.

AU - Luke, G. M.

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N2 - We have studied the superconducting properties of the isostructural ternary noncentrosymmetric superconductors TaXSi (X=Re, Ru) with the help of muon spin rotation/relaxation (μSR) and density functional theory calculations. Our transverse-field μSR measurements indicate isotropic s-wave superconductivity in TaReSi and multigap superconductivity in TaRuSi. Zero-field μSR measurements, highly sensitive to very small magnetic fields, find no evidence of spontaneous fields in the superconducting state of TaReSi, whereas we observe small spontaneous fields that onset with superconductivity indicating broken time-reversal symmetry (TRS) superconductivity in TaRuSi. Using density functional theory calculations, we find that spin-orbit coupling is relatively weak in TaRuSi and strong in TaReSi. Using symmetry analysis, we attribute the broken TRS in TaRuSi to a nonunitary triplet pairing state. Such a state is not allowed in the presence of strong spin-orbit coupling: our finding of no evidence for broken TRS in TaReSi is consistent with this expectation.

AB - We have studied the superconducting properties of the isostructural ternary noncentrosymmetric superconductors TaXSi (X=Re, Ru) with the help of muon spin rotation/relaxation (μSR) and density functional theory calculations. Our transverse-field μSR measurements indicate isotropic s-wave superconductivity in TaReSi and multigap superconductivity in TaRuSi. Zero-field μSR measurements, highly sensitive to very small magnetic fields, find no evidence of spontaneous fields in the superconducting state of TaReSi, whereas we observe small spontaneous fields that onset with superconductivity indicating broken time-reversal symmetry (TRS) superconductivity in TaRuSi. Using density functional theory calculations, we find that spin-orbit coupling is relatively weak in TaRuSi and strong in TaReSi. Using symmetry analysis, we attribute the broken TRS in TaRuSi to a nonunitary triplet pairing state. Such a state is not allowed in the presence of strong spin-orbit coupling: our finding of no evidence for broken TRS in TaReSi is consistent with this expectation.

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Evidence for nonunitary triplet-pairing superconductivity in noncentrosymmetric TaRuSi and comparison with isostructural TaReSi

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