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 journalArticlepeer-review

14 Scopus citations


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
Issue number16
StatePublished - Oct 17 2007

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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

Cite this