Structural phase transition associated with van Hove singularity in 5d transition metal compound IrTe2

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	Structural phase transition associated with van Hove singularity in 5d transition metal compound IrTe2
	Qian, T ; Miao, H ; Wang, ZJ ; Shi, X ; Huang, YB ; Zhang, P ; Xu, N ; Zeng, LK ; Ma, JZ ; Richard, P ; Shi, M ; Xu, G ; Dai, X ; Fang, Z ; Fang, AF ; Wang, NL ; Ding, H
刊名	NEW JOURNAL OF PHYSICS
	2014
卷号	16
关键词	IrTe2 charge density wave van Hove singularity
ISSN号	1367-2630
通讯作者	Qian, T (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	We have investigated the electronic states of IrTe2 by using angle-resolved photoemission spectroscopy to elucidate the origin of the structural phase transition. Both the Ir 4f and Te 4d core level spectra exhibit dramatic splitting below the phase transition temperature T-s, suggesting that there exist two inequivalent Ir and Te sites with distinctly different electronic states in the distorted phase. The band related to the saddle points at the Fermi level (E-F) is strongly reconstructed, which removes the van Hove singularity from E-F below T-s. The wavevector connecting the adjacent saddle points is consistent with the in-plane superstructure modulation wavevector. These results indicate that the phase transition in IrTe2 is intimately associated with the saddle points. As the van Hove singularity mainly originates from the Te p(x)+p(y) orbitals, the Te 5p electronic states play a dominant role in the structural phase transition.
资助信息	MOST [2010CB923000, 2013CB921700, 2011CBA001000, 2011CB921701, 2012CB821403]; CAS [2010Y1JB6, XDB07000000]; NSFC [11004232, 11050110422, 11204359, 11120101003, 11074291, 11121063, 11234014, 11274362]; SSSTC [IZLCZ2 138954]; University of Wisconsin-Madison; U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-05CH112]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59398]
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	Qian, T,Miao, H,Wang, ZJ,et al. Structural phase transition associated with van Hove singularity in 5d transition metal compound IrTe2[J]. NEW JOURNAL OF PHYSICS,2014,16.
APA	Qian, T.,Miao, H.,Wang, ZJ.,Shi, X.,Huang, YB.,...&Ding, H.(2014).Structural phase transition associated with van Hove singularity in 5d transition metal compound IrTe2.NEW JOURNAL OF PHYSICS,16.
MLA	Qian, T,et al."Structural phase transition associated with van Hove singularity in 5d transition metal compound IrTe2".NEW JOURNAL OF PHYSICS 16(2014).