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EPR of Distorted CrO4^3- Centers in Single Crystals of Potassium Alum
並列摘要
Electron paramagnetic resonance of the CrO4^3- center in potassium alum indicates that there are twelve magnetically inequivalent sites in a unit cell. The magnetic symmetry of this center is axial, but the symmetry axis tilts away from the 3-fold axis by a small angle. The CrO4^3- center is distorted; in addition to a distortion along the 3-fold axis of the host lattice, there is a small distortion perpendicular to the 3-fold axis. The effects of local hydrogen vacancy and of static Jahn-Teller distortion will be discussed to account for the perpendicular distortion.