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Published October 19, 2007 | Version Published
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Anomalous Metallic State of Cu_(0.07)TiSe_2: An Optical Spectroscopy Study

Creators

  • 1. ROR icon Princeton University

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.

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Published - PhysRevLett.99.167002.pdf

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PhysRevLett.99.167002.pdf

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Additional details

Additional titles

Alternative title
Anomalous Metallic State of Cu(0.07)TiSe2: An Optical Spectroscopy Study

Identifiers

Eprint ID
49035
Resolver ID
CaltechAUTHORS:20140828-192348141

Funding

National Science Foundation of China (NSFC)
Knowledge Innovation Project of Chinese Academy of Sciences
Ministry of Science and Technology of China
NSF
DMR-0213706
Department of Energy (DOE)
DE-FG-02-05ER46200

Dates

Created
2014-08-29
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Updated
2021-11-10
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