TY - JOUR
T1 - Anomalous critical scattering from a three-dimensional percolating antiferromagnet RbMn0.31Mg0.69F3
AU - Itoh, S.
AU - Iwasa, K.
AU - Bull, M. J.
PY - 2002/12
Y1 - 2002/12
N2 - 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.
AB - 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.
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U2 - 10.1007/s003390101152
DO - 10.1007/s003390101152
M3 - Article
AN - SCOPUS:0037003669
VL - 74
SP - S789-S791
JO - Applied Physics A: Materials Science and Processing
JF - Applied Physics A: Materials Science and Processing
SN - 0947-8396
IS - SUPPL.I
ER -