Gap structure of the nonsymmorphic superconductor LaNiGa2 probed by μSR

Shyam Sundar; M. Yakovlev; N. Azari; M. Abedi; D. M. Broun; H. U. Özdemir; S. R. Dunsiger; D. Zackaria; H. Bowman; P. Klavins; Y. Shi; V. Taufour; J. E. Sonier

doi:10.1103/PhysRevB.109.104517

Gap structure of the nonsymmorphic superconductor LaNiGa2 probed by μSR

Shyam Sundar, M. Yakovlev, N. Azari, M. Abedi, D. M. Broun, H. U. Özdemir, S. R. Dunsiger, D. Zackaria, H. Bowman, P. Klavins, Y. Shi, V. Taufour, J. E. Sonier

DOI 10.1103/PhysRevB.109.104517 · Physical Review B

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Abstract

We report muon-spin rotation (μSR) measurements of the temperature dependence of the absolute value of the magnetic penetration depth and the magnetic field dependence of the vortex core size in the mixed state of the nonsymmorphic superconductor LaNiGa2. The temperature dependence of the superfluid density is shown to be well described by a two-band model with strong interband coupling. Consistent with a strong coupling of the superconducting condensates in two different bands, we show that the field dependence of the vortex core size resembles that of a single-band superconductor. Our results lend support to the proposal that LaNiGa2 is a fully gapped, internally antisymmetric, nonunitary spin-triplet superconductor.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaNiGa2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2	Pressure not reported	onset
LaNiGa2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.84	Pressure not reported	unknown
LaNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown