Two-gap time reversal symmetry breaking superconductivity in noncentrosymmetric LaNiC2

Shyam Sundar; S. R. Dunsiger; S. Gheidi; K. S. Akella; A. M. Côté; H. U. Özdemir; N. R. Lee-Hone; D. M. Broun; E. Mun; F. Honda; Y. J. Sato; T. Koizumi; R. Settai; Y. Hirose; I. Bonalde; J. E. Sonier

doi:10.1103/PhysRevB.103.014511

Two-gap time reversal symmetry breaking superconductivity in noncentrosymmetric LaNiC2

Shyam Sundar, S. R. Dunsiger, S. Gheidi, K. S. Akella, A. M. Côté, H. U. Özdemir, N. R. Lee-Hone, D. M. Broun, E. Mun, F. Honda, Y. J. Sato, T. Koizumi, R. Settai, Y. Hirose, I. Bonalde, J. E. Sonier

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We report a μSR investigation of a noncentrosymmetric superconductor (LaNiC2) in single-crystal form. Compared to previous μSR studies of noncentrosymmetric superconducting polycrystalline and powder samples, the unambiguous orientation of single crystals enables a simultaneous determination of the absolute value of the magnetic penetration depth and the vortex core size from measurements that probe the magnetic field distribution in the vortex state. The magnetic field dependence of these quantities unambiguously demonstrates the presence of two nodeless superconducting energy gaps. In addition, we detect weak internal magnetic fields in the superconducting phase, confirming earlier μSR evidence for a time-reversal symmetry-breaking superconducting state. Our results suggest that Cooper pairing in LaNiC2 is characterized by an interorbital equal-spin pairing model introduced to unify the pairing states of LaNiC2 and the centrosymmetric superconductor LaNiGa2.

Original language	English
Article number	014511
Journal	Physical Review B
Volume	103
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.103.014511
Publication status	Published - Jan 20 2021
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.103.014511

Cite this

Sundar, S., Dunsiger, S. R., Gheidi, S., Akella, K. S., Côté, A. M., Özdemir, H. U., Lee-Hone, N. R., Broun, D. M., Mun, E., Honda, F., Sato, Y. J., Koizumi, T., Settai, R., Hirose, Y., Bonalde, I., & Sonier, J. E. (2021). Two-gap time reversal symmetry breaking superconductivity in noncentrosymmetric LaNiC2. Physical Review B, 103(1), Article 014511. https://doi.org/10.1103/PhysRevB.103.014511

@article{fa6243339f5c44af9d212ca2a3f84005,

title = "Two-gap time reversal symmetry breaking superconductivity in noncentrosymmetric LaNiC2",

abstract = "We report a μSR investigation of a noncentrosymmetric superconductor (LaNiC2) in single-crystal form. Compared to previous μSR studies of noncentrosymmetric superconducting polycrystalline and powder samples, the unambiguous orientation of single crystals enables a simultaneous determination of the absolute value of the magnetic penetration depth and the vortex core size from measurements that probe the magnetic field distribution in the vortex state. The magnetic field dependence of these quantities unambiguously demonstrates the presence of two nodeless superconducting energy gaps. In addition, we detect weak internal magnetic fields in the superconducting phase, confirming earlier μSR evidence for a time-reversal symmetry-breaking superconducting state. Our results suggest that Cooper pairing in LaNiC2 is characterized by an interorbital equal-spin pairing model introduced to unify the pairing states of LaNiC2 and the centrosymmetric superconductor LaNiGa2.",

author = "Shyam Sundar and Dunsiger, {S. R.} and S. Gheidi and Akella, {K. S.} and C{\^o}t{\'e}, {A. M.} and {\"O}zdemir, {H. U.} and Lee-Hone, {N. R.} and Broun, {D. M.} and E. Mun and F. Honda and Sato, {Y. J.} and T. Koizumi and R. Settai and Y. Hirose and I. Bonalde and Sonier, {J. E.}",

note = "Funding Information: We thank Manfred Sigrist for insightful discussions and the staff of TRIUMF's Centre for Molecular and Materials Science for technical support. J.E.S., S.R.D., D.M.B. and E.M. acknowledge support from the Natural Sciences and Engineering Research Council of Canada. This research is also supported by the Japan Society for the Promotion of Science KAKENHI under Grants No. JP15K05156 and No. JP15KK0149. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

year = "2021",

month = jan,

day = "20",

doi = "10.1103/PhysRevB.103.014511",

language = "English",

volume = "103",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Physical Society",

number = "1",

}

TY - JOUR

T1 - Two-gap time reversal symmetry breaking superconductivity in noncentrosymmetric LaNiC2

AU - Sundar, Shyam

AU - Dunsiger, S. R.

AU - Gheidi, S.

AU - Akella, K. S.

AU - Côté, A. M.

AU - Özdemir, H. U.

AU - Lee-Hone, N. R.

AU - Broun, D. M.

AU - Mun, E.

AU - Honda, F.

AU - Sato, Y. J.

AU - Koizumi, T.

AU - Settai, R.

AU - Hirose, Y.

AU - Bonalde, I.

AU - Sonier, J. E.

N1 - Funding Information: We thank Manfred Sigrist for insightful discussions and the staff of TRIUMF's Centre for Molecular and Materials Science for technical support. J.E.S., S.R.D., D.M.B. and E.M. acknowledge support from the Natural Sciences and Engineering Research Council of Canada. This research is also supported by the Japan Society for the Promotion of Science KAKENHI under Grants No. JP15K05156 and No. JP15KK0149. Publisher Copyright: © 2021 American Physical Society.

PY - 2021/1/20

Y1 - 2021/1/20

N2 - We report a μSR investigation of a noncentrosymmetric superconductor (LaNiC2) in single-crystal form. Compared to previous μSR studies of noncentrosymmetric superconducting polycrystalline and powder samples, the unambiguous orientation of single crystals enables a simultaneous determination of the absolute value of the magnetic penetration depth and the vortex core size from measurements that probe the magnetic field distribution in the vortex state. The magnetic field dependence of these quantities unambiguously demonstrates the presence of two nodeless superconducting energy gaps. In addition, we detect weak internal magnetic fields in the superconducting phase, confirming earlier μSR evidence for a time-reversal symmetry-breaking superconducting state. Our results suggest that Cooper pairing in LaNiC2 is characterized by an interorbital equal-spin pairing model introduced to unify the pairing states of LaNiC2 and the centrosymmetric superconductor LaNiGa2.

AB - We report a μSR investigation of a noncentrosymmetric superconductor (LaNiC2) in single-crystal form. Compared to previous μSR studies of noncentrosymmetric superconducting polycrystalline and powder samples, the unambiguous orientation of single crystals enables a simultaneous determination of the absolute value of the magnetic penetration depth and the vortex core size from measurements that probe the magnetic field distribution in the vortex state. The magnetic field dependence of these quantities unambiguously demonstrates the presence of two nodeless superconducting energy gaps. In addition, we detect weak internal magnetic fields in the superconducting phase, confirming earlier μSR evidence for a time-reversal symmetry-breaking superconducting state. Our results suggest that Cooper pairing in LaNiC2 is characterized by an interorbital equal-spin pairing model introduced to unify the pairing states of LaNiC2 and the centrosymmetric superconductor LaNiGa2.

UR - http://www.scopus.com/inward/record.url?scp=85100202216&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85100202216&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.103.014511

DO - 10.1103/PhysRevB.103.014511

M3 - Article

AN - SCOPUS:85100202216

SN - 2469-9950

VL - 103

JO - Physical Review B

JF - Physical Review B

IS - 1

M1 - 014511

ER -

Two-gap time reversal symmetry breaking superconductivity in noncentrosymmetric LaNiC2

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this