유화 Spinel Co0.95Fe0.05Cr₂S₄에서 Jahn - Teller Distortion에 의한 Mossbauer 공명 흡수선의 변화에 관한 연구

다국어 초록 (Multilingual Abstract)

Sulphur Spinel Co_(0.95)Fe_(0.05)Cr₂S₄ has been studied with Mossbauer Spectroscopy between 4.2 K and room temperature. The Fe²+ ion in a tetrahedral site is the Jahn-Teller active and the dynamic Jahn-Teller distorts below the magnetic ordering temperature. The distortion cause a quadrupole shift to appear which increases with decreasing temperature. The magnetic hyperfine field has a maximum at 100 K and then decreases with decreasing temperature. The magnitude of the interaction ratio R between the electric quadrupole and magnetic dipole interaction increases from 0 near the magnetic ordering temperature to 5.4 at 4.2 K. The optimum values of θ, the polar angle of the magnetic hyperfine field with respect to the principle axis of the electric field gradient (EFG) remains zero and the asymmetry of the EFG η is about 0.25. The simulations of Mossbauer spectra coincidence with the experimental results.