Anomalous metallic state of Cu$_{0.07}$TiSe$_2$: an optical spectroscopy study

Details Anomalous metallic state of Cu$_{0.07}$TiSe$_2$: an optical spectroscopy study Anomalous metallic state of Cu$_{0.07}$TiSe$_2$: an optical spectroscopy study

2007-06-29

arxiv.org/abs/0706.4455v1

Phys. Rev. Lett. 99, 167002 (2007)

Physics

Condensed Matter

Superconductivity

4 figures, 4+ pages

Scientific paper

10.1103/PhysRevLett.99.167002

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 sizeable 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 later effect.

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