Absence of spontaneous magnetism associated with a possible time-reversal symmetry breaking state beneath the surface of (110)-oriented YBa2Cu3O7-delta superconducting films

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    TUNNEL-JUNCTIONS;    MU-SR;    GENERATION;    BOUNDARIES;    DEPTH;    FLUX;    PSI;   

DOI  :  10.1103/PhysRevB.88.180501

来源: SCIE

【 摘 要 】

We report the results of a search for spontaneous magnetism due to a time-reversal symmetry breaking phase in the superconducting state of (110)-oriented YBa2Cu3O7-delta films, expected near the surface in this geometry. Zero field and weak transverse field measurements performed using the low-energy muon spin rotation technique with muons implanted a few nm inside optimally doped YBa2Cu3O7-delta-(110) films show no appearance of spontaneous magnetic fields below the superconducting temperature down to 2.9 K. Our results give an upper limit of similar to 0.02 mT for putative spontaneous internal fields.

【 授权许可】

Free