The electronic structure of La0.85Zr0.15MnO3 studied by x-ray absorption spectroscopy

• Main Authors: Hang-Ming Lee, 李鴻民
• Other Authors: Way-Faung Pong
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/45332632854166796363

碩士 === 淡江大學 === 物理學系碩士班 === 97 === The electronic and atomic structures of the La0.85Zr0.15MnO3 were investigated by measuring the Mn K-, O K-, and Mn L3-edge x-ray absorption near-edge structure (XANES) and Mn K-edge extended x-ray absorption fine structure (EXAFS) at various temperatures. The Mn K- edge, O K-and Mn L3,2-edge XANES at room temperature indicated that Mn ions in the sample is between 3+ and 4+, thus the behavior of the sample is expected to be hole doped . The temperature-dependent O K-, and Mn L3,2-edge XANES spectra indicated that hybrization of the O 2p-Mn 3d unoccupied state has opposite tendency at the ferromagnetic metal and anti-ferromagnetic insulator region caused by charge transfer effect. EXAFS revealed both receptivity and magnetic susceptibility around the TMI (the transition temperature of metal to insulator) and TC (the transition temperature of anti-ferromagnet to ferromagnet) change significantly due to structural distortion.