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.

UR - http://www.scopus.com/inward/record.url?scp=0037003669&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037003669&partnerID=8YFLogxK

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 -