Magnetic Modes in Rare Earth Perovskites: A Magnetic-Field-Dependent Inelastic Light Scattering study.

ABSTRACT: Here, we report the presence of defect-related states with magnetic degrees of freedom in crystals of LaAlO₃ and several other rare-earth based perovskite oxides using inelastic light scattering (Raman spectroscopy) at low temperatures in applied magnetic fields of up to 9 T. Some of these states are at about 140 meV above the valence band maximum while others are mid-gap states at about 2.3 eV. No magnetic impurity could be detected in LaAlO₃ by Proton-Induced X-ray Emission Spectroscopy. We, therefore, attribute the angular momentum-like states in LaAlO₃ to cationic/anionic vacancies or anti-site defects. Comparison with the other rare earth perovskites leads to the empirical rule that the magnetic-field-sensitive transitions require planes of heavy eleme

SUBMITTER: Saha S 

PROVIDER: S-EPMC5109287 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature