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La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy
Cheng, J; Sun, XY; Liu, SL; Li, B; Wang, HY; Dong, P; Wang, Y; Xu, W; Xu W(徐伟)
2016
发表期刊NEW JOURNAL OF PHYSICS
卷号18
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.
文章类型期刊论文
关键词5d transition metal oxides spin-orbit interaction crystal electric field XAS
DOI10.1088/1367-2630/18/9/093019
关键词[WOS]SUPERCONDUCTIVITY ; TEMPERATURE ; OXIDES
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000384093400004
引用统计
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260327
专题多学科研究中心
作者单位中国科学院高能物理研究所
推荐引用方式
GB/T 7714
Cheng, J,Sun, XY,Liu, SL,et al. La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy[J]. NEW JOURNAL OF PHYSICS,2016,18.
APA Cheng, J.,Sun, XY.,Liu, SL.,Li, B.,Wang, HY.,...&徐伟.(2016).La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy.NEW JOURNAL OF PHYSICS,18.
MLA Cheng, J,et al."La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy".NEW JOURNAL OF PHYSICS 18(2016).
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