Concentration dependence of the random field crossover scaling in FexZn1−xF2

Autor:	A. R. King, V. Jaccarino, I. B. Ferreira
Rok vydání:	1991
Předmět:	Physics Random field Birefringence Condensed matter physics Transition temperature Crossover Exponent General Physics and Astronomy Ising model Scaling Randomness
Zdroj:	Journal of Applied Physics. 69:5246-5248
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.348093
Popis:	The proportionality between the field‐induced shift ΔTc(H) of the transition temperature Tc(H) and the root‐mean‐square (rms) random‐field hRF was studied over a wide range of concentration (0.31≤x≤0.84) in the nearly ideal random‐field Ising model (RFIM) system FexZn1−xF2. Tc(H) was determined experimentally from the optical birefringence Δn, for which d(Δn)/dT exhibits a peak proportional to the magnetic specific heat. For all x studied, Tc(H) was found to shift from the H=0 transition at TN as ΔTc(H)ΔTc(H)= cTN h2/φRF as predicted, with φ=1.42±0.03 the universal random exchange to RFIM crossover exponent, after a mean‐field correction bH2. The nonuniversal quantity c was found to be of order unity as expected, but slightly x dependent.
Databáze:	OpenAIRE
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