MU+SR STUDY OF 2-DIMENSIONAL ANTIFERROMAGNETS, DELAFOSSITE-TYPE COMPOUNDS

Mu+SR experiments were performed on delafossite-type compounds, CuCrO2, AgCrO2, CuFeO2, which are model compounds of triangular lattice antiferromagnets. The initial asymmetries are much smaller than the expected value, implying muonium formation. The time spectra are composed of slow and fast relaxation components. We attributed the components to signals from mu+ stopped at the center of O2- ions and muonium far from nuclear dipole moments, respectively. The asymmetries decrease below T(N) but no precession spectra were observed. Relaxation rates of slow and fast relaxation components show maxima at T(N).