Time-Dependent Phenomena in a Short-Range Ising Spin-Glass, Fe0.5Mn0.5TiO3

Abstract

Magnetization measurements have been made on an insulating random mixture, ${\mathrm{Fe}}_{0.5}$ ${\mathrm{Mn}}_{0.5}$Ti${\mathrm{O}}_3$. An Ising spin-glass behavior has been observed below $T_g=21.1\mathrm{}$ K. It is shown that the time-dependent phenomena are well characterized by an algebraic function with the exponent described by an exponential function of temperature. The results are compared with the computer-simulation results obtained by Ogielski. In addition, we suggest the existence of a thermodynamic equilibrium state in magnetic fields.