Unconventional Superconductivity in La_{7}Ir_{3} Revealed by Muon Spin Relaxation: Introducing a New Family of Noncentrosymmetric Superconductor That Breaks Time-Reversal Symmetry

Physical Review Letters
J A T BarkerR P Singh

Abstract

The superconductivity of the noncentrosymmetric compound La_{7}Ir_{3} is investigated using muon spin rotation and relaxation. Zero-field measurements reveal the presence of spontaneous static or quasistatic magnetic fields below the superconducting transition temperature T_{c}=2.25  K-a clear indication that the superconducting state breaks time-reversal symmetry. Furthermore, transverse-field rotation measurements suggest that the superconducting gap is isotropic and that the pairing symmetry of the superconducting electrons is predominantly s wave with an enhanced binding strength. The results indicate that the superconductivity in La_{7}Ir_{3} may be unconventional and paves the way for further studies of this family of materials.

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Citations

Jun 28, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D KumarL J Chang
Jan 14, 2018·Scientific Reports·B LiXiaofeng Xu
Sep 12, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A BhattacharyyaA D Hillier
Jan 11, 2017·Reports on Progress in Physics·M SmidmanD F Agterberg
Jan 5, 2019·Physical Review Letters·T ShangT Shiroka
Sep 12, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D SinghR P Singh
Aug 20, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D A MayohM R Lees
Jan 23, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D SinghR P Singh
May 6, 2019·Physical Review Letters·A BhattacharyyaP Manfrinetti
Dec 22, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·D SinghR P Singh
Jul 30, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Sudeep GhoshHuiqiu Yuan
Dec 19, 2020·Physical Review Letters·Julia M Link, Igor F Herbut

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