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Spectroscopic evidence of multigap superconductivity in noncentrosymmetric AuBe

Datta, S and Vasdev, A and Rana, PS and Motla, K and Kataria, A and Singh, RP and Das, T and Sheet, G (2022) Spectroscopic evidence of multigap superconductivity in noncentrosymmetric AuBe. In: Physical Review B, 105 (10).

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Official URL: https://doi.org/10.1103/PhysRevB.105.104505


AuBe is a chiral, noncentrosymmetric superconductor with transition temperature TC≃3.25 K. The broken inversion symmetry in its crystal structure makes AuBe a possible candidate to host a mixed singlet-triplet pairing symmetry in its superconducting order parameter (Δ). This possibility was investigated by transport, thermodynamic, and muon-spin rotation/relaxation experiments in AuBe. However, this issue was not addressed using direct spectroscopic probes so far. In addition, certain ambiguities exist in the description of superconductivity in AuBe based on μSR experiments reported earlier. Here we report scanning tunneling spectroscopy (STS) on AuBe down to 300 mK. We found a signature of two superconducting gaps (with 2Δ1/kBTC=4.37 and 2Δ2/kBTC=2.46, respectively) and a clean BCS-like temperature dependence of both the gaps. We have also performed band structure calculations to identify the different bands that might give rise to the observed two-gap superconductivity in AuBe.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Crystal symmetry; Gold alloys; Scanning tunneling microscopy; Temperature distribution, Crystals structures; Inversion symmetry; Muon spin rotation; Noncentrosymmetric superconductors; Pairing symmetries; Rotation relaxation; Singlet-triplet; Spectroscopic evidence; Superconducting order parameters; Triplet pairing, Binary alloys
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 15 Jun 2022 09:56
Last Modified: 15 Jun 2022 09:56
URI: https://eprints.iisc.ac.in/id/eprint/73777

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