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Order Parameter Criticality of the d=3 Random-Field Ising Antiferromagnet Fe(0.85)Zn(0.15)F2

F. Ye·L. Zhou·S. Larochelle·L. Lu·D. P. Belanger·M. Greven·D. Lederman
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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 Fe(0.85)Zn(0.15)F2 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.

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F. Ye, L. Zhou, S. Larochelle, L. Lu, D. P. Belanger, M. Greven, D. Lederman. 2002-09-29. Order Parameter Criticality of the d=3 Random-Field Ising Antiferromagnet Fe(0.85)Zn(0.15)F2. https://doi.org/10.1103/physrevlett.89.157202

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