Electronic Structure and Fermiology of Superconducting LaNiGa${}_2$

Abstract

We report electronic structure calculations for the layered centrosymmetric superconductor LaNiGa${}_2$, which has been identified as having a possible triplet state based on evidence for time reversal symmetry breaking. The Fermi surface has several large sheets and is only moderately anisotropic, so that the material is best described as a three dimensional metal. These include sections that are open in the in-plane direction as well as a section that approaches the zone center. The density of states is high and primarily derived from Ga $p$ states, which hybridize with Ni $d$ states. Comparing with experimental specific heat data, we infer a superconducting $\lambda \le$ 0.55, which implies that this is a weak to intermediate coupling material. However, the Ni occurs in a nominal $d^{10}$ configuration in this material, which places the compound far from magnetism. Implications of these results for superconductivity are discussed.

References in corpus (4)

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• Ferromagnetic spin fluctuation induced superconductivity in Sr_2RuO_4
• Non-unitary triplet pairing in the centrosymmetric superconductor LaNiGa${}_2$
• Why Ni${}_3$Al is an itinerant ferromagnet but Ni${}_3$Ga is not

Cited by in corpus (8)

• Recent progress on superconductors with time-reversal symmetry breaking
• Two-gap superconductivity in LaNiGa${}_2$ with non-unitary triplet pairing and even parity gap symmetry
• Quantitative Theory of Triplet Pairing in the Unconventional Superconductor LaNiGa${}_2$
• Dirac lines and loop at the Fermi level in the Time-Reversal Symmetry Breaking Superconductor LaNiGa${}_2$
• Nonunitary Superconductivity in Complex Quantum Materials
• Electron irradiation reveals robust fully gapped superconductivity in LaNiGa${}_2$
• Correlation effects in the electronic structure of the Ni-based superconducting KNi2S2
• Thermopower of the electron-doped manganese pnictide LaMnAsO