Indexed by: Journal paper

Correspondence Author: T Qian

Co-author: H Ding,NL Wang,AF Fang,Z Fang,X Dai,G Xu,M Shi,P Richard,JZ Ma,LK Zeng,N Xu,P Zhang,YB Huang,X Shi,ZJ Wang,H Miao

Journal: New Journal of Physics

Included Journals: SCI

Discipline: 物理学

Document Type: J

Volume: 16

Issue: 12

Page Number: 123038

ISSN No.: 1367-2630

Date of Publication: 2014-12-15

Impact Factor: 3.558

Abstract: We have investigated the electronic states of IrTe 2 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 IrTe 2 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.