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Time-reversal symmetry breaking in frustrated superconductor Re2Hf

Mandal, M and Kataria, A and Patra, C and Singh, D and Biswas, PK and Hillier, AD and Das, T and Singh, RP (2022) Time-reversal symmetry breaking in frustrated superconductor Re2Hf. In: Physical Review B, 105 (9).

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Official URL: https://doi.org/10.1103/PhysRevB.105.094513


Geometrical frustration leads to novel quantum phenomena such as the spin-liquid phase in triangular and kagome lattices. Intraband and interband Fermi surface (FS) nesting can drive unique superconducting (SC) ground states with d-wave and s±-pairing symmetries, respectively, according to the criterion that the SC gap changes sign across the nesting wave vector. For an odd number of FSs, when multiple interband nesting is of comparable strength, the sign-reversal criterion between different FS sheets can lead to frustration, which promotes novel SC order parameters. Here, we report the experimental observation of a time-reversal symmetry breaking pairing state in Re2Hf resulting from FS nesting frustration. Furthermore, our electronic specific heat and transverse-field muon spin rotation experiments suggest a fully gapped pairing symmetry. The first-principles electronic structure calculation reveals multiple Fermi surface sheets with comparable interband nesting strength. Implementing the ab initio band structure, we compute spin-fluctuation mediated SC pairing symmetry which reveals an s+is�-pairing state - consistent with experimental observations. Our investigation demonstrates an alternative SC state which provides a putative setting for both applied and fundamental study. © 2022 American Physical Society.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to authors.
Keywords: Calculations; Electronic structure; Ground state; Specific heat; Spin fluctuations; Superconducting materials, Fermi surface nesting; Geometrical frustrations; Inter-band nesting; Kagome lattice; Pairing symmetries; Quantum phenomena; Spin-liquid phase; Symmetry breakings; Time reversal symmetries; Triangular-lattice, Fermi surface
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 17 May 2022 11:11
Last Modified: 17 May 2022 11:11
URI: https://eprints.iisc.ac.in/id/eprint/71786

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