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Superconducting double transition and substantial Knight shift in Sr2RuO₄

Gupta, R., Saunderson, T., Shallcross, S., Gradhand, M., Quintanilla, J., Annett, J. (2020) Superconducting double transition and substantial Knight shift in Sr2RuO₄. Physical Review B: Condensed Matter and Materials Physics, 102 . Article Number 235203. ISSN 0163-1829. (doi:10.1103/PhysRevB.102.235203) (KAR id:84668)

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Abstract

Recent nuclear magnetic resonance experiments measuring the Knight shift in Sr2RuO4 have challenged the widely accepted picture of chiral pairing in this superconductor. Here we study the implications of helical pairing on the superconducting state while comparing our results with the available experimental data on the upper critical field and Knight shift. We solve the Bogoliubov–de Gennes equation employing a realistic three-dimensional tight-binding model that captures the experimental Fermi surface very well. In agreement with experiments we find a Pauli limiting to the upper critical field and, at low temperatures and high fields, a second superconducting transition. These transitions, which form a superconducting subphase in the H-T phase diagram are first-order in nature and merge into a single second-order transition at a bicritical point (T∗,H∗),for which we find (0.8 K, 2.4 T) with experiment reporting (0.8 K,∼1.2 T) [Phys. Rev. B93, 184513 (2016)]. Furthermore, we find a substantial drop in the Knight shift in agreement with recent experiments.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.102.235203
Uncontrolled keywords: Physics of Quantum Materials
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Divisions: Divisions > Division of Natural Sciences > School of Physical Sciences
Depositing User: Jorge Quintanilla Tizon
Date Deposited: 30 Nov 2020 17:47 UTC
Last Modified: 20 May 2021 11:10 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/84668 (The current URI for this page, for reference purposes)
Quintanilla, J.: https://orcid.org/0000-0002-8572-730X
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