Internal magnetic fields in the high-T c superconductors La 1.8Sr 0.2CuO 4 and YBa 2Cu 3O 7−δ from muon spin rotation experiments

Abstract

Measurements of the internal magnetic field in the high- T c superconductors La 1.8Sr 0.2CuO 4 and YBa 2Cu 3O 7−δ have been performed after zero-field cooling using the muon spin rotation (μSR) technique. Temperature-dependent changes are observed below T c in both the magnitude of the internal field and the fraction of muons which experience this field.