The random-field specific heat critical behavior at high magnetic concentration: Fe(0.93)Zn(0.07)F2

Physics – Condensed Matter – Disordered Systems and Neural Networks

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9 pages, 4 figures, RevTeX, minor revisions

Scientific paper

10.1016/S0304-8853(98)00065-1

The specific heat critical behavior is measured and analyzed for a single crystal of the random-field Ising system Fe(0.93)Zn(0.07)F2 using pulsed heat and optical birefringence techniques. This high magnetic concentration sample does not exhibit the severe scattering hysteresis at low temperature seen in lower concentration samples and its behavior is therefore that of an equilibrium random-field Ising model system. The equivalence of the behavior observed with pulsed heat techniques and optical birefringence is established. The critical peak appears to be a symmetric, logarithmic divergence, in disagreement with random-field model computer simulations. The random-field specific heat scaling function is determined.

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