The dynamical magnetic properties of an Ising spin glass (SG) Fe0.55Mn0.45TiO₃ are studied under various magnetic fields. Having determined the temperature and static-field-dependent relaxation time τ(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 SG phase transition only in zero field. We next argue that the data τ(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.
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Jönsson et al. (2005) studied this question.
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