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Time-reversal symmetry breaking in superconductors through loop super-current order

Ghosh, Sudeep K., Annett, James F, Quintanilla, Jorge (2019) Time-reversal symmetry breaking in superconductors through loop super-current order. Cornell University - Pre-Print Server, . (In press)

Abstract

We propose a superconducting instability where microscopic loop super-currents form spontaneously within a unit cell at the critical temperature, Tc. Such currents break time-reversal symmetry (TRS) without needing an unconventional pairing mechanism. Using Ginzburg-Landau theory, we describe in detail how they emerge in a toy model. We discuss the crystal symmetry requirements more generally and show that they are met by the Re6X (X=Zr, Hf, Ti) family of TRS-breaking, but otherwise seemingly conventional, superconductors. We estimate an upper bound for the resulting internal fields, which is consistent with recent muon-spin relaxation experiments.

Item Type: Article
Uncontrolled keywords: Physics of Quantum Materials
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: James Burt
Date Deposited: 31 Jul 2019 08:09 UTC
Last Modified: 14 Feb 2020 04:11 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/75634 (The current URI for this page, for reference purposes)
Quintanilla, Jorge: https://orcid.org/0000-0002-8572-730X
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