Electron irradiation reveals robust fully gapped superconductivity in LaNiGa2

Ghimire, Sunil; Joshi, Kamal R.; Krenkel, Elizabeth H.; Tanatar, Makariy A.; Shi, Yunshu; Kończykowski, Marcin; Grasset, Romain; Taufour, Valentin; Orth, Peter P.; Scheurer, Mathias S.; Prozorov, Ruslan

doi:10.1103/physrevb.109.024515

Title: Electron irradiation reveals robust fully gapped superconductivity in LaNiGa 2

Journal Article · Mon Jan 29 00:00:00 UTC 2024 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.109.024515 · OSTI ID:2305610

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Ames Lab., and Iowa State Univ., Ames, IA (United States)
Univ. of California, Davis, CA (United States)
Ecole Polytechnique, Palaiseau (France). Laboratoire des Solides Irradiés; Centre National de la Recherche Scientifique (CNRS) (France)
Ames Lab., and Iowa State Univ., Ames, IA (United States); Saarland University Campus, Saarbrücken (Germany)
Univ. of Stuttgart (Germany)

The effects of 2.5-MeV electron irradiation were studied in the superconducting phase of single crystals of LaNiGa₂, using measurements of electrical transport and radio-frequency magnetic susceptibility. The London penetration depth is found to vary exponentially with temperature, suggesting a fully gapped Fermi surface. The inferred superfluid density is close to that of a single-gap weak-coupling isotropic s^– wave superconductor. Superconductivity is extremely robust against nonmagnetic point-like disorder induced by electron irradiation. Our results place strong constraints on the previously proposed triplet pairing state by requiring fine-tuned impurity scattering amplitudes and are most naturally explained by a sign-preserving, weak-coupling, and approximately momentum-independent singlet superconducting state in LaNiGa₂, which does not break time-reversal symmetry. Finally, we discuss how our findings could be reconciled with previous measurements that indicated magnetic signatures in the superconducting phase.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 2305610

Report Number(s):: IS-J--11,260

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 2 Vol. 109; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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