In this paper, we report initial β NMR measurements seeking the spontaneous magnetic fields associated with a time-reversal symmetry breaking (TRSB) order at the (1 1 0) interface of the high temperature superconductor YBa2 Cu3 O7 - δ (YBCO). A 2 keV beam of highly spin-polarized 8Li+ was implanted into a thin overlayer of silver sputtered onto an oriented YBCO film. The NMR of 8Li in the Ag layer showed additional broadening with an onset below the superconducting transition temperature Tc. This is evidence of spontaneous disordered magnetism which could be associated with TRSB order.
- β NMR
- Time-reversal symmetry breaking
- YBa Cu O
ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering