X-Ray Polarization Anomaly of Forbidden Reflections of Iron Pyrite, FeS_<b>2</b>, near the Fe K-Absorption Edge

Abstract

X-ray polarization analysis of allowed and forbidden reflections from iron pyrite, FeS 2 , was carried out using synchrotron radiation. Since the incident beam was σ-polarized, the polarization of allowed reflections was also σ. However, the polarization of the forbidden reflections showed complex structure. From investigating the polarization and its azimuthal angle dependence, it was concluded that the reflections were caused by the ATS (Anisotropy of the Tensor of Susceptibility) scattering.