Study of the charge and spin ordering in SrFeOx using X-ray scattering

• Main Authors: Yi-Shiuan Lin, 林意軒
• Other Authors: Chao-Hung Du
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/57034261056795234786

碩士 === 淡江大學 === 物理學系碩士班 === 102 === We report the study of charge/spin-ordering in single crystal SrFeOx using resonant soft x-ray scattering. Probing the charge and spin ordering using x-rays is difficult due mainly to the very weak diffraction intensity. However, this difficulty can be overcome by the use of resonant x-ray diffraction. In this study, we performed the resonant soft x-ray diffraction at the Fe L-edge and O K-edge, and observed a huge enhancement from the spin and charge ordering reflections. The wave vectors of charge- and spin-ordering in SrFeOx were observed to be Qco ≈ (0, 0, 0.64) and Qso ≈ (0, 0, 0.5) with transition temperatures at Tco ≈ 107 K for charge ordering and Tso ≈ 65 K for spin. These reflections were also further confirmed to originate from charges and spins, respectively, using the different polarized x-rays.