SrFeOx的電荷與電子自旋有序結構之X光散射研究

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Title:	SrFeOx的電荷與電子自旋有序結構之X光散射研究
Other Titles:	Study of the charge and spin ordering in SrFeOx using X-ray scattering
Authors:	林意軒;Lin, Yi-Shiuan
Contributors:	淡江大學物理學系碩士班杜昭宏;Du, Chao-Hung
Keywords:	軟X光;相變化;電荷有序;電子自旋有序;共振散射;Soft X-ray;phase transition;charge ordering;Spin ordering;Resonant Scattering;SrFeOx
Date:	2014
Issue Date:	2015-05-01 16:11:01 (UTC+8)
Abstract:	本論文主要是利用X光共振散射與變溫量測來探討在SrFeOx中的電荷有序（charge-ordering）與電子自旋所有序結構（spin-ordering）。由於電荷與磁結構的散射截面積非常小，所以利用一般X光繞射技術無法獲得足夠的強度來分析研究，為了能得到足夠的繞射強度，因此利用了軟X光共振散射使繞射峰強度增加。實驗中利用入射光在Fe L2,L3-edge與O K-edge所產生的共振效應來增加來自charge-ordering與spin-ordering繞射峰的散射振幅，並利用此繞射峰對能量變化的關係圖來探討Fe電子在3d軌域的電子結構。樣品 SrFeOx的電荷有序結構波向量為Qco ≈（0, 0, 0.64），而電子自旋有序結構的波向量為Qso ≈（0, 0, 0.5），針對這兩個波向量進行變溫量測觀察其結構的相變化，其結構的相變溫度分別為Tco ≈ 107K以及Tso ≈ 65K，並利用X光的二向性，即水平線偏振光與垂直線偏振光，來探討電荷結構與電子自旋的行為與方向性。 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.
Appears in Collections:	[Graduate Institute & Department of Physics] Thesis

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