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

Sudeep Kumar Ghosh, James F. Annett, Jorge Quintanilla

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

We propose a superconducting instability where loop Josephson-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 show how they emerge in a toy model and estimate the size of the resulting magnetization, which is consistent with recent muon-spin relaxation experiments. We discuss the crystal symmetry requirements and show that they are met by the Re6X (X=Zr, Hf, Ti) family of TRS-breaking, but otherwise seemingly conventional, superconductors.
Original languageEnglish
JournalarXiv
Publication statusSubmitted - 7 Mar 2018

Bibliographical note

6 pages, 3 figures (More references added)

Keywords

  • cond-mat.supr-con

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