Violation of time-reversal symmetry inYBa2Cu3O7−xfilms
| Autor: | A. Burau, H.-J. Weber, J. Blechschmidt |
|---|---|
| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Physical Review B. 49:6991-7003 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.49.6991 |
| Popis: | We present a concept for the search for optical effects which indicates a violation of time-reversal symmetry in high-${\mathit{T}}_{\mathit{c}}$ superconductors. The idea is to investigate the reaction of the material on a magnetic field in a magneto-optical transmission experiment. Below 150 K an annealing field of 400 Oe induces an optical quantity which remains after the field is switched off and which depends on the sign of the field. This signature of broken time-reversal symmetry is confirmed in fields up to 50 kOe. Our results are consistent with a phenomenological theory which takes into account the presence of strains in films. The strains enable a switching of antiferromagnetic domains by magnetoelastic interactions. This interpretation is supported by the dependence of the optical response on \ensuremath{\Vert}H\ensuremath{\Vert}. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|