Semimetal to semimetal charge density wave transition in 1T-TiSe$_2$

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

doi:10.1103/PhysRevLett.99.027404

Semimetal to semimetal charge density wave transition in 1T-TiSe$_2$

Strongly Correlated Electrons 2009-11-13 v2 Superconductivity

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

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Abstract

We report an infrared study on 1 $T$ -TiSe $_2$ , the parent compound of the newly discovered superconductor Cu $_x$ TiSe $_2$ . Previous studies of this compound have not conclusively resolved whether it is a semimetal or a semiconductor: information that is important in determining the origin of its unconventional CDW transition. Here we present optical spectroscopy results that clearly reveal that the compound is metallic in both the high-temperature normal phase and the low-temperature CDW phase. The carrier scattering rate is dramatically different in the normal and CDW phases and the carrier density is found to change with temperature. We conclude that the observed properties can be explained within the scenario of an Overhauser-type CDW mechanism.

Keywords

1T-TiSe2 charge density wave semimetal infrared spectroscopy Overhauser mechanism superconductor parent compound

Cite

@article{arxiv.cond-mat/0703167,
  title  = {Semimetal to semimetal charge density wave transition in 1T-TiSe$_2$},
  author = {G. Li and W. Z. Hu and D. Qian and D. Hsieh and M. Z. Hasan and E. Morosan and R. J. Cava and N. L. Wang},
  journal= {arXiv preprint arXiv:cond-mat/0703167},
  year   = {2009}
}

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4 pages, 4 pages

Semimetal to semimetal charge density wave transition in 1T-TiSe$_2$

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