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Anomalous Metallic State of Cu_(0.07)TiSe_2: An Optical Spectroscopy Study

Li, G. and Hu, W. Z. and Dong, J. and Qian, D. and Hsieh, D. and Hasan, M. Z. and Morosan, E. and Cava, R. J. and Wang, N. L. (2007) Anomalous Metallic State of Cu_(0.07)TiSe_2: An Optical Spectroscopy Study. Physical Review Letters, 99 (16). Art. No. 167002. ISSN 0031-9007. doi:10.1103/PhysRevLett.99.167002.

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We report an optical spectroscopy study on the newly discovered superconductor Cu_(0.07)TiSe_2. Consistent with the development from a semimetal or semiconductor with a very small indirect energy gap upon doping TiSe_2, it is found that the compound has a low carrier density. Most remarkably, the study reveals a substantial shift of the screened plasma edge in reflectance towards high energy with decreasing temperature. This phenomenon, rarely seen in metals, indicates either a sizable increase of the conducting carrier concentration or/and a decrease of the effective mass of carriers with reducing temperature. We attribute the shift primarily to the latter effect.

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Hsieh, D.0000-0002-0812-955X
Alternate Title:Anomalous Metallic State of Cu(0.07)TiSe2: An Optical Spectroscopy Study
Additional Information:© 2007 The American Physical Society. Received 8 January 2007. Revised 30 June 2007. Published 17 October 2007. We acknowledge very helpful discussions with Z. Q. Wang, L. Yin, D. L. Feng, Q. H. Wang, and Lu Yu. This work is supported by 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 NSF (No. DMR-0213706) and U.S. DOE No. DE-FG-02-05ER46200.
Funding AgencyGrant Number
National Science Foundation of China (NSFC)UNSPECIFIED
Knowledge Innovation Project of Chinese Academy of SciencesUNSPECIFIED
Ministry of Science and Technology of ChinaUNSPECIFIED
Department of Energy (DOE)DE-FG-02-05ER46200
Issue or Number:16
Classification Code:PACS numbers: 74.25.Gz, 72.80.Ga, 78.20.e
Record Number:CaltechAUTHORS:20140828-192348141
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49035
Deposited By: Joy Painter
Deposited On:29 Aug 2014 20:36
Last Modified:10 Nov 2021 18:39

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