Research Papers in Physics and Astronomy


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Published by American Physical Society. Copyright 1995. Permission to use. Phys. Rev. Lett. 75, 2412 (1995).


The well-known peak of the parallel ac susceptibility arising below TN in Fe0.47Zn0.53F2 splits into a narrow critical peak at Tc (H) and a broad field-induced Griffiths phase shoulder peaking at Tp>Tc(H) in magnetic fields H≳1.6 MA /m. Random-field (RF) criticality with α̃≈0 and subsequent rounding due to RF trapping of thermal fluctuations are observed upon zero-field cooling as T→Tc-(H). The frozen domain state obtained after rapid field cooling reveals excess susceptibility Δχw′∝H2.6, owing to rough walls with thermally activated stiffness.

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