Internal Magnetic-Fields In The High-Tc Superconductors La1.8sr0.2cuo4 And Yba2cu3o7-Delta From Muon Spin Rotation Experiments

Abstract Measurements of the internal magnetic field in the high- T c superconductors La 1.8 Sr 0.2 CuO 4 and YBa 2 Cu 3 O 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.