"Glassy Dynamics" in Ising Spin Glasses -- Experiment and Simulation

TL;DR

This study combines experimental and simulation approaches to investigate the glassy dynamics of Ising spin glasses, revealing a dynamical transition characterized by a cusp in magnetization rather than an equilibrium phase transition.

Contribution

It provides a unified explanation of experimental and simulation results using the droplet picture, highlighting the dynamical nature of the transition.

Findings

Cusp-like behavior indicates a dynamical ('blocking') transition.

Results support the droplet picture over equilibrium phase transition theories.

Experiment and simulation results are consistent and explain glassy dynamics.

Abstract

The field-cooled magnetization (FCM) processes of Ising spin glasses under relatively small fields are investigated by experiment on Fe_{0.55}Mn_{0.45}TiO_3 and by numerical simulation on the three-dimensional Edwards-Anderson model. Both results are explained in a unified manner by means of the droplet picture. In particular, the cusp-like behavior of the FCM is interpreted as evidence, not for an equilibrium phase transition under a finite magnetic field, but for a dynamical (`blocking') transition frequently observed in glassy systems.