Abstract
Positive muon spin rotation (µ + SR) is applied to La 2- x Ba x CuO 4 around x =0.12, where superconductivity is suppressed remarkably. The magnetic ordering of Cu-moments appears below 35 K in the narrow range of 0.11≦ x ≦0.135, where the transition from the low-temperature orthorhombic (LTO) to the low-temperature tetragonal (LTT) structure exists. The present study suggests strongly that the magnetic ordering of Cu-moments plays an important role in the suppression of the high- T c superconductivity around x =0.12 in La 2- x Ba x CuO 4 .
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