Pressure Tuning of the Spin-Orbit Coupled Ground State in Sr2IrO4

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	Pressure Tuning of the Spin-Orbit Coupled Ground State in Sr2IrO4
	Haskel, D ; Fabbris, G ; Zhernenkov, M ; Kong, PP ; Jin, CQ ; Cao, G ; van Veenendaal, M
刊名	PHYSICAL REVIEW LETTERS
	2012
卷号	109 期号:2
关键词	MAGNETIC CIRCULAR-DICHROISM SUPERCONDUCTIVITY SR2RUO4 PROBE IRON
ISSN号	0031-9007
通讯作者	Haskel, D (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
中文摘要	X-ray absorption spectroscopy studies of the magnetic-insulating ground state of Sr2IrO4 at ambient pressure show a clear deviation from a strong spin-orbit (SO) limit J(eff) = 1/2 state, a result of local exchange interactions and a nonzero tetragonal crystal field mixing SO split J(eff) = 1/2, 3/2 states. X-ray magnetic circular dichroism measurements in a diamond anvil cell show a magnetic transition at a pressure of similar to 17 GPa, where the "weak" ferromagnetic moment is quenched despite transport measurements showing insulating behavior to at least 40 GPa. The magnetic transition has implications for the origin of the insulating gap and the nature of exchange interactions in this SO coupled system. The expectation value of the angular part of the SO interaction, < L (.) S >, extrapolates to zero at similar to 80-90 GPa where an increased bandwidth strongly mixes J(eff) = 1/2, 3/2 states and SO interactions no longer dominate the electronic ground state of Sr2IrO4.
收录类别	SCI
资助信息	U.S. Department of Energy, Office of Science [DE-AC02-06CH11357, DE-FG02-03ER46097]; NSF [DMR-0856234, EPS-0814194]; NSF MOST of China
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/51427]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Haskel, D,Fabbris, G,Zhernenkov, M,et al. Pressure Tuning of the Spin-Orbit Coupled Ground State in Sr2IrO4[J]. PHYSICAL REVIEW LETTERS,2012,109(2).
APA	Haskel, D.,Fabbris, G.,Zhernenkov, M.,Kong, PP.,Jin, CQ.,...&van Veenendaal, M.(2012).Pressure Tuning of the Spin-Orbit Coupled Ground State in Sr2IrO4.PHYSICAL REVIEW LETTERS,109(2).
MLA	Haskel, D,et al."Pressure Tuning of the Spin-Orbit Coupled Ground State in Sr2IrO4".PHYSICAL REVIEW LETTERS 109.2(2012).