期刊
NEW JOURNAL OF PHYSICS
卷 16, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/16/12/123038
关键词
IrTe2; charge density wave; van Hove singularity
资金
- 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]
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.
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