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Experimental study of the critical scattering from a two-dimensional random Ising antiferromagnet

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
The magnetic critical fluctuations in the d = 2 random-exchange antiferromagnet Rb/sub 2/Co/sub 0.7/Mg/sub 0.3/F/sub 4/ have been studied by neutron diffraction at temperatures both above and below the Neel temperature T/sub N/ = 40.8 K. At temperatures above T/sub N/, the line shape of the critical scattering is well described by the Lorentzian form, and the critical exponents ..nu.. and ..gamma.. for the inverse correlation length kappa/sup +/ = kappa/sub 0//sup +/chemically bondtchemically bond/sup ..nu../ and the staggered susceptibility chi/sup +/ = C/sub 0//sup +/chemically bondtchemically bond/sup -//sup ..gamma../ are in good agreement with the values for the pure d = 2 Ising model.
Research Organization:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
OSTI ID:
6045820
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:1; ISSN PRBMD
Country of Publication:
United States
Language:
English