Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies
學年 105
學期 2
出版（發表）日期 2017-03-13
作品名稱 Anisotropy in the thermal hysteresis of resistivity and charge density wave nature of single crystal SrFeO3-δ: X-ray absorption and photoemission studies
作品名稱（其他語言）
著者 Shang Hsien Hsieh; R.S. Solanki; Y. F. Wang; Y. C. Shao; Shu-Han Lee; C.H. Yao; Chao-Hung Du; H.T. Wang; J. W. Chiou; Y.Y. Chin; H. M. Tsai; Jeng-Lung Chen; Chih-Wen Pao; Cheng-Maw Cheng; Wei-Chuan Chen; Hong-Ji Lin; Jyh-Fu Lee; Fang-Cheng Chou; Way-Faung Pong
單位
出版者
著錄名稱、卷期、頁數 Scientific Reports 7, 161(11pages)
摘要 The local electronic and atomic structures of the high-quality single crystal of SrFeO3-δ (δ~0.19) were studied using temperature-dependent x-ray absorption and valence-band photoemission spectroscopy (VB-PES) to investigate the origin of anisotropic resistivity in the ab-plane and along the c-axis close to the region of thermal hysteresis (near temperature for susceptibility maximum, Tm~78 K). All experiments herein were conducted during warming and cooling processes. The Fe L 3,2-edge X-ray linear dichroism results show that during cooling from room temperature to below the transition temperature, the unoccupied Fe 3d e g states remain in persistently out-of-plane 3d 3z2-r2 orbitals. In contrast, in the warming process below the transition temperature, they change from 3d 3z2-r2 to in-plane 3d x2-y2 orbitals. The nearest-neighbor (NN) Fe-O bond lengths also exhibit anisotropic behavior in the ab-plane and along the c-axis below Tm. The anisotropic NN Fe-O bond lengths and Debye-Waller factors stabilize the in-plane Fe 3d x2-y2 and out-of-plane 3d 3z2-r2 orbitals during warming and cooling, respectively. Additionally, a VB-PES study further confirms that a relative band gap opens at low temperature in both the ab-plane and along the c-axis, providing the clear evidence of the charge-density-wave nature of SrFeO3-δ (δ~0.19) single crystal.
關鍵字
語言 en
ISSN 2045-2322
期刊性質 國外
收錄於 SCI
產學合作 國外
通訊作者
審稿制度 是
國別 GBR
公開徵稿
出版型式 ,電子版
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