La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy

doi:10.1088/1367-2630/18/9/093019

	La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy
	Li, B; Cheng, J; Sun, XY; Liu, SL; Wang, HY; Dong, P; Wang, Y; Xu, W; Xu W(徐伟)
刊名	NEW JOURNAL OF PHYSICS
	2016
卷号	18
关键词	5d transition metal oxides spin-orbit interaction crystal electric field XAS
DOI	10.1088/1367-2630/18/9/093019
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.
语种	英语
WOS记录号	WOS:000384093400004
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/260327]
专题	中国科学院高能物理研究所
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	Li, B,Cheng, J,Sun, XY,et al. La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy[J]. NEW JOURNAL OF PHYSICS,2016,18.
APA	Li, B.,Cheng, J.,Sun, XY.,Liu, SL.,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	Li, B,et al."La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy".NEW JOURNAL OF PHYSICS 18(2016).