Research Papers in Physics and Astronomy


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Published by American Physical Society. Copyright 1994. Permission to use. Phys. Rev. Lett. 72 (1994) 1287.


Domainlike antiferromagnetic correlations are detected by SQUID measurements of the low-frequency susceptibility in the metamagnet FeCl2 when exposed to an axial magnetic field H at temperatures Tc (H)≤T≤TN. A distinct change of curvature of χ’’ vs T appearing at TN is explained in terms of fluctuating distributions of demagnetizing fields and, hence, transition temperatures. The field-induced dynamic domain phase—an analog of the Griffiths phase predicted for a ferromagnet with dilution x within Tc(x)≤T≤Tc(0)—is confirmed by elastic light scattering experiments.

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