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Order parameter criticality of the d = 3 random-field Ising antiferromagnet Fe0.85Zn0.15F2
1Department of Physics, University of California, Santa Cruz 95064, USA.
Physical Review Letters
|October 9, 2002
Abstract:
The critical exponent beta=0.16+/-0.02 for the random-field Ising model order parameter is determined using extinction-free magnetic x-ray scattering for Fe0.85Zn0.15F2 in magnetic fields of 10 and 11 T. The observed value is consistent with other experimental random-field critical exponents, but disagrees sharply with Monte Carlo and exact ground state calculations on finite-sized systems.