Ye F, Zhou L, Larochelle S, Lu L, Belanger D P, Greven M, Lederman D
Department of Physics, University of California, Santa Cruz 95064, USA.
Phys Rev Lett. 2002 Oct 7;89(15):157202. doi: 10.1103/PhysRevLett.89.157202. Epub 2002 Sep 24.
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.
利用在10和11特斯拉磁场中对Fe0.85Zn0.15F2进行无消光磁x射线散射，确定了随机场伊辛模型序参量的临界指数β = 0.16±0.02。观测值与其他实验随机场临界指数一致，但与有限尺寸系统的蒙特卡罗和精确基态计算结果有很大差异。
