Magnetism of oxygen deficient perovskite La 8− xSr xCu 8O 20

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We have measured muon spin relaxation (μSR) of La 8− x Sr x Cu 8O 20, an oxygen deficient perovskite, across two magnetic phase transitions at T= T c1 and T c2. Static magnetic order was observed below T∼140 K, where weak ferromagnetism appears in magnetization measurements ( T c1). No significant change appeared in the μSR static field width at the lower transition temperature T c2, where an anomaly is seen in the Hall coefficient. The static magnetism thus originates from localized spins presumably in the one-dimensional Cu–O chains.