Magnetic ordering in La 2Cu 2O 5

Abstract

Muon spin relaxation (μSR) measurements were carried out on La 2Cu 2O 5, which is a candidate for the spin 1 2 4-leg Heisenberg antiferromagnetic ladder system. At room temperature, the μSR spectrum can be fitted with the static Gaussian Kubo–Toyabe function. This spectrum originates from static nuclear dipole fields of copper. At ∼140 K , a sudden decrease of the initial asymmetry was observed. This suggests that a long-range magnetic ordering of the Cu 2+ spins occurs due to nonnegligible interladder interactions.