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Semimetal-to-Semimetal Charge Density Wave Transition in 1T-TiSe_2

Li, G. and Hu, Z. and Qian, D. and Hsieh, D. and Hasan, M. Z. and Morosan, E. and Cava, R. J. and Wang, N. L. (2007) Semimetal-to-Semimetal Charge Density Wave Transition in 1T-TiSe_2. Physical Review Letters, 99 (2). Art. No. 027404. ISSN 0031-9007. doi:10.1103/PhysRevLett.99.027404.

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We report an infrared study on 1T-TiSe_2, the parent compound of the newly discovered superconductor Cu_xTiSe_2. Previous studies of this compound have not conclusively resolved whether it is a semimetal or a semiconductor—information that is important in determining the origin of its unconventional charge density wave (CDW) transition. Here we present optical spectroscopy results that clearly reveal that the compound is metallic in both the high-temperature normal phase and the low-temperature CDW phase. The carrier scattering rate is dramatically different in the normal and CDW phases and the carrier density is found to change with temperature. We conclude that the observed properties can be explained within the scenario of an Overhauser-type CDW mechanism.

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Hsieh, D.0000-0002-0812-955X
Alternate Title:Semimetal-to-Semimetal Charge Density Wave Transition in 1T-TiSe2
Additional Information:© 2007 The American Physical Society. Received 6 February 2007. Published 13 July 2007. We acknowledge very helpful discussions with W. Ku, T. M. Rice, T. Tohyama, R. S. Markiewicz, Z. Q. Wang, X. C. Xie, and Lu Yu. This work is supported by the National Science Foundation of China, the Knowledge Innovation Project of Chinese Academy of Sciences, and the Ministry of Science and Technology of China. M. Z. H. and R. J. C. acknowledge partial support through the NSF (No. DMR-0213706) and U.S. DOE Grants No. DE-FG-02-05ER46200 and No. DE-FG02-98ER45706.
Funding AgencyGrant Number
National Science Foundation of ChinaUNSPECIFIED
Knowledge Innovation Project of Chinese Academy of SciencesUNSPECIFIED
Ministry of Science and Technology of ChinaUNSPECIFIED
Department of Energy (DOE)DE-FG- 02-05ER46200
Department of Energy (DOE)DE-FG02-98ER45706
Issue or Number:2
Classification Code:PACS numbers: 78.20.e, 71.30.+h, 71.35.y, 72.80.Ga
Record Number:CaltechAUTHORS:20140908-082820675
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49307
Deposited By: Joy Painter
Deposited On:08 Sep 2014 17:44
Last Modified:10 Nov 2021 18:42

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