Measurements of ATS Scattering from Magnetite near the Fe K-Absorption Edge in the Temperature Range 290, K--80, K

Abstract

X-ray resonant scattering, due to the anisotropic tensor of susceptibility (ATS), from magnetite, Fe₃O₄, near the Fe K-absorption edge, was measured from room temperature to 80, K. The energy dependence of the 002 “forbidden” reflection intensity showed two sharp peaks just above and below the edge. The azimuthal dependence of both peaks was well described by an anisotropic second rank tensor of an iron atom at the B-site (octahedral site) of the spinel lattice. The energy dependence of the reflection at 80, K was almost the same as that at room temperature except for an additional intensity enhancement due to the structural transition. The temperature hysterisis of the intensity through the transition was observed for both the allowed 004 and “forbidden” 002 reflections.