We have performed neutron scattering experiments to investigate the static magnetic structure and the magnetic critical scattering in the three-dimensional percolating Heisenberg antiferromagnet, RbMn0.31 Mg0.69 F3, whose magnetic concentration is just at the percolation concentration for a cubic lattice, cP = 0.312. Magnetic scattering was observed around the superlattice point, (frac(1, 2), frac(1, 2), frac(1, 2)). We determined the Néel temperature of this system to be TN = 4.0 ± 0.5 K, and found that the critical scattering above TN is similar to that observed in the homogeneous system. At T = 1.6 K well below TN, 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.
- Magnetic phase transition
- Neutron scattering
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering