Anomalous critical scattering from a three-dimensional percolating antiferromagnet RbMn0.31Mg0.69F3

S. Itoh, K. Iwasa, M. J. Bull

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A neutron-diffraction experiment was performed to measure the critical scattering from a percolating antiferromagnet RbMn0.31Mg0.69F3, whose magnetic concentration is just at the percolation concentration for a cubic lattice, cp = 0.312. The magnetic scattering was observed at around the superlattice point (1/2, 1/2, 1/2). We found that the scattering function exhibits a non-Lorentzian line shape, S(q) = (q2 + κ2)-x (q and κ are the momentum transfer and the inverse correlation length, respectively), with the exponent x = 0.6 ± 0.1 at the low temperature of 1.6 K, and that the exponent is attributed to the fractal structure of the percolating network. Also, the system was found to exhibit a crossover to the homogeneous state at high temperature.

Original languageEnglish
Pages (from-to)S789-S791
JournalApplied Physics A: Materials Science and Processing
Issue numberSUPPL.I
Publication statusPublished - 2002 Dec

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)


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