Quantitative Theory of Triplet Pairing in the Unconventional Superconductor LaNiGa 2

Sudeep Kumar Ghosh*, Gábor Csire*, Philip Whittlesea, James F Annett, Martin Gradhand, Balázs Újfalussy, Jorge Quintanilla*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

The exceptionally low-symmetry crystal structures of the time-reversal symmetry breaking superconductors LaNiC2 and LaNiGa2 lead to an internally-antisymmetric non-unitary triplet (INT) state as the only possibility compatible with experiments. We argue that this state has a distinct signature: a double-peak structure in the Density of States (DOS) which resolves in the spin channel in a particular way. We construct a detailed model of LaNiGa2 capturing its electronic band structure and magnetic properties ab initio. The pairing mechanism is described via a single adjustable parameter. The latter is fixed by the critical temperature Tc allowing parameter-free predictions. We compute the electronic specific heat and find excellent agreement with experiment. The size of the ordered moment in the superconducting state is compatible with zero-field muon spin relaxation experiments and the predicted spin-resolved DOS suggests the spin-splitting is within the reach of present experimental technology.
Original languageEnglish
Article number100506(R)
JournalPhysical Review B
Volume101
DOIs
Publication statusPublished - 30 Mar 2020

Keywords

  • first-principles calculations
  • multiband superconductivity
  • spin-triplet pairing
  • superconducting gap
  • superconducting order parameter
  • superconductivity
  • unconventional superconductors

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