Abstract
High-field magnetization measurements, with H ≤20 T, yield the random-field Ising model (RFIM) specific heat behavior near the H – T phase boundary in Fe 0.84 Zn 0.16 F 2 . This sample, with x greater than the magnetic vacancy percolation threshold, x v =0.754, is in the concentration range that shows equilibrium neutron scattering line shapes at low temperature and | q |>0, unlike samples for which x < x v . The temperature derivative of the uniform magnetization shows the expected low-field random-field Ising scaling behavior for H ≤18 T. At H =20 T, however, the peak temperature and amplitude are significantly suppressed, indicating a high-field RFIM region of the H – T phase diagram.
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