ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The d=2 random-field Ising system Rb2Co0.85 Mg0.15F4 has been studied using pulsed, high-field magnetization M measurements. A relatively sharp metastability boundary TF(H) has been discovered which separates a frozen region below from an equilibrium one above TF(H). TF(H) scales as does the (destroyed) phase transition "Tc(H)'' as TN −TF(H) ∝H2/φ, with the measured crossover exponent φ=1.8±0.1 in good agreement with the d=2 susceptibility exponent γ=7/4. As measured in the pulsed field experiment, TF(H) lies well below "Tc(H)'' but above the value of TF(H) obtained from recent neutron scattering studies. The difference in the two values of TF(H) is attributed to the log t time dependence of the approach to equilibrium and to magnetocaloric effects.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.335127
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