Published October 19, 2007
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Anomalous Metallic State of Cu_(0.07)TiSe_2: An Optical Spectroscopy Study
Abstract
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.
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.Attached Files
Published - PhysRevLett.99.167002.pdf
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Additional details
- Alternative title
- Anomalous Metallic State of Cu(0.07)TiSe2: An Optical Spectroscopy Study
- Eprint ID
- 49035
- Resolver ID
- CaltechAUTHORS:20140828-192348141
- National Science Foundation of China (NSFC)
- Knowledge Innovation Project of Chinese Academy of Sciences
- Ministry of Science and Technology of China
- DMR-0213706
- NSF
- DE-FG-02-05ER46200
- Department of Energy (DOE)
- Created
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2014-08-29Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field