H. Aruga Katori

Nonequilibrium dynamics of spin glasses: Examination of the ghost domain scenario

Extensive experimental and numerical studies of the non-equilibrium dynamics of spin glasses subjected to temperature or bond perturbations have been performed to investigate chaos and memory effects in selected spin glass systems. Temperature shift and cycling experiments were performed on the strongly anisotropic Ising-like system {\ising} and the weakly anisotropic Heisenberg-like system {\AgMn}, while bond shift and cycling simulations were carried out on a 4 dimensional Ising Edwards-Anderson spin glass. These spin glass systems display qualitatively the same characteristic features and the observed memory phenomena are found to be consistent with predictions from the ghost domain scenario of the droplet scaling model.

Specific heat study of the field-induced magnetic ordering in the spin-gap system TlCuCl 3

Specific heat measurements have been performed in the coupled dimer system

Memory and chaos in an Ising spin glass

{\mathrm{TlCuCl}}_{3},

Domain growth by isothermal aging in 3D Ising and Heisenberg spin glasses.

which has a singlet ground state with the excitation gap

Dynamical breakdown of the Ising spin-glass order under a magnetic field

\ensuremath{\Delta}\ensuremath{\simeq}7.5

Absence of Hysteresis in the Heat Capacity of the Three-Dimensional Random-Field Ising Model

K. The cusplike anomaly indicative of the three-dimensional magnetic ordering was clearly observed in magnetic fields higher than the critical field

Equilibrium and nonequilibrium magnetic behaviour of a reentrant Ising spin glass

{H}_{\mathrm{g}}

The reentrant Ising Spin Glass Fe0.62Mn0.38TiO3 Studied with the Mössbauer Technique

corresponding to the gap

Aging, rejuvenation, and memory effects in Ising and Heisenberg spin glasses

\ensuremath{\Delta}.

Magnetization plateau in the frustrated quantum spin systemCs2CuBr4

The phase boundary determined by the present specific heat measurements coincides with that determined by previous magnetization measurements. The phase boundary can be described by the power law