Quantitative theory of triplet pairing in the unconventional superconductor LaNiGa2
Ghosh, Sudeep Kumar ![ORCID Identifier](/img/uab/orcid.ico)
(University of Kent)
Csire, Gabor ![ORCID Identifier](/img/uab/orcid.ico)
(Institut Català de Nanociència i Nanotecnologia)
Whittlesea, Philip (University of Kent)
Annett, James ![ORCID Identifier](/img/uab/orcid.ico)
(University of Bristol)
Gradhand, Martin (University of Bristol)
Újfalussy, Balázs (Hungarian Academy of Sciences)
Quintanilla, Jorge (University of Kent)
Date: |
2020 |
Abstract: |
The exceptionally low-symmetry crystal structures of the time-reversal symmetry-breaking superconductors LaNiC2 and LaNiGa2 lead to an internally antisymmetric nonunitary triplet 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. |
Grants: |
European Commission 754510
|
Rights: |
Tots els drets reservats. ![](/img/licenses/InC.ico) |
Language: |
Anglès |
Document: |
Article ; recerca ; Versió sotmesa a revisió |
Subject: |
Adjustable parameters ;
Critical temperatures ;
Electronic band structure ;
Electronic specific heat ;
Low symmetry crystals ;
Superconducting state ;
Time reversal symmetries ;
Unconventional superconductors |
Published in: |
Physical review B, Vol. 101, Issue 10 (March 2020) , art. 100506, ISSN 2469-9969 |
DOI: 10.1103/PhysRevB.101.100506
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Record created 2020-07-27, last modified 2023-05-24