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题名: La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy
作者: Cheng, J; Sun, XY; Liu, SL; Li, B; Wang, HY; Dong, P; Wang, Y; Xu, W
刊名: NEW JOURNAL OF PHYSICS
出版日期: 2016
卷号: 18, 页码:-
关键词: 5d transition metal oxides ; spin-orbit interaction ; crystal electric field ; XAS
DOI: 10.1088/1367-2630/18/9/093019
通讯作者: Cheng, J ; Liu, SL ; Li, B (reprint author), Nanjing Univ Posts & Telecommun, Coll Sci, Ctr Adv Funct Ceram, Nanjing 210023, Jiangsu, Peoples R China. ; Liu, SL (reprint author), Nanjing Univ, Suzhou High Tech Inst, Suzhou 215123, Peoples R China.
文章类型: 期刊论文
英文摘要: Sr2IrO4 was predicted to be an unconventional superconductor upon carrier doping since it highly resembles the high-temperature cuprates. Here, to understand carrier doping effect on spin-orbit coupled Mott insulator Sr2IrO4, the electronic structure and local structure distortion for Sr2-xLaxIrO4 system have been investigated by x-ray absorption spectroscopy. By comparing the intensity of white-line features at the Ir L-2,L-3 absorption edges, we observe remarkably large branching ratios in La-doped compounds, greater than that of the parent material Sr2IrO4, suggesting a strong spin-orbit interaction for Sr2IrO4-based system. Moreover, extended x-ray absorption fine structure spectra demonstrate more regular IrO6 octahedra, i.e. the weakened crystal electric field versus La-doping. By theoretical calculations, the synergistic effect of regular IrO6 octahedra and electron doping is established, which accounts for the transition from a Mott insulator to a conductive state in Sr2-xLaxIrO4-based system.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000384093400004
ISSN号: 1367-2630
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/26557
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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