MU(+)SR STUDY OF ISING SPIN-GLASS FE0.5MN0.5TIO3

A typical Ising spin-glass Fe0.5Mn0.5TiO3 has been investigated by mu+ spin relaxation measurements. It is found that the local magnetic fields at the mu+ stopping sites appear at a temperature twice as high as T(SG). The directional distribution of the local magnetic fields is nearly isotropic, indicating the existence of the transverse spin components. It is clearly demonstrated that the spins fluctuate below T(SG) and even at approximately 4 K. Taking into account the results obtained by other methods, the main part of the fluctuations is inferred to be due to the transverse spin components and the fluctuation times at approximately 4 K are driven into a range between approximately 10(-5) and approximately 10(-7) S.