Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Page Number
227602
Volume
101
Issue
22
Abstract
The cascade of temperature and field-driven transitions in LuFe<2/>O<4/> was investigated byM�Nossbauer and optical spectroscopies, magnetization, and x-ray scattering. A correlation of Fe2+ ��Fe3+ charge transfer excitations with the 320 K phase transition below which uperstructure reflections appear confirms its association with gradual charge carrier freezing. Fe2+ on-site excitations are sensitive to the 175 K magnetic transition, which Bragg splitting and large magneto optical contrast suggest involes a monoclinic distortion that can be driven by both temperature and magnetic field.
PACS numbers: 71.30.+h,75.30.Kz,78.20.Ci,76.70.+y
