Anomalous metallic state of Cu0.07TiSe2: An optical spectroscopy study

G. Li, W. Z. Hu, J. Dong, D. Qian, D. Hsieh, M. Z. Hasan, E. Morosan, R. J. Cava, N. L. Wang

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

We report an optical spectroscopy study on the newly discovered superconductor Cu0.07TiSe2. Consistent with the development from a semimetal or semiconductor with a very small indirect energy gap upon doping TiSe2, 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.

Original languageEnglish (US)
Article number167002
JournalPhysical review letters
Volume99
Issue number16
DOIs
StatePublished - Oct 17 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Anomalous metallic state of Cu0.07TiSe2: An optical spectroscopy study'. Together they form a unique fingerprint.

  • Cite this