Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 19, 2007 | Published
Journal Article Open

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

Files

PhysRevLett.99.167002.pdf
Files (540.5 kB)
Name Size Download all
md5:962952debd725ff02e9df639b9798d92
540.5 kB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 17, 2023