Abstract
We have performed neutron scattering experiments to investigate the static magnetic structure and the magnetic critical scattering in the three-dimensional percolating Heisenberg antiferromagnet, RbMn 0.31 Mg 0.69 F 3 , whose magnetic concentration is just at the percolation concentration for a cubic lattice, c P = 0.312 . Magnetic scattering was observed around the superlattice point, ( 1 2 , 1 2 , 1 2 ) . We determined the Néel temperature of this system to be T N = 4.0 ± 0.5 K , and found that the critical scattering above T N is similar to that observed in the homogeneous system. At T = 1.6 K well below T N , the scattering function is described by a sum of the critical scattering and elastic scattering components, and we demonstrated that the q -variation of the intensity of the elastic scattering component can be described using the fractal dimension.
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