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

Abstract

The dynamical magnetic properties of an Ising spin glass Fe${}_{0.55}$Mn${}_{0.45}$TiO${}_3$ are studied under various magnetic fields. Having determined the temperature and static field dependent relaxation time $\tau (T;H)$ from ac magnetization measurements under a dc bias field by a general method, we first demonstrate that these data provide evidence for a spin-glass (SG) phase transition only in zero field. We next argue that the data $\tau (T;H)$ of finite $H$ can be well interpreted by the droplet theory which predicts the absence of a SG phase transition in finite fields.

arXiv comment4 pages, 5 figures

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