Experimental and theoretical evidence for a new universality class in FeF3: A 3D lattice with frustrated Heisenberg spins (abstract)
- 1 May 1990
- journal article
- dissertation
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 67 (9) , 5457
- https://doi.org/10.1063/1.345842
Abstract
The pyrochlore form of FeF3 is a Heisenberg antiferromagnet [TN=15.2(1)K], in which the Fe3+ atoms form a high‐symmetry lattice of corner‐sharing tetrahedra. The low‐temperature magnetic structure is noncollinear with four sublattices oriented 109° from each other. Neutron diffraction was used to determine the critical exponent, β=0.17(2), which does not correspond to any known universality class. Monte Carlo simulations with finite‐size scaling analysis confirm the measured value of β and also provide the exponent ν=0.34(4). The existence of this new universality class supports Kawamura’s hypothesis that critical properties of a system depend on the symmetry properties (and not just the dimensionality) of the order parameter.This publication has 0 references indexed in Scilit: