On the origin of the anomalous peak in the resistivity of TiSe2

Matthew David Watson, Adam M. Beales, Philip David King

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
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Abstract

Resistivity measurements of TiSe2 typically show only a weak change in gradient at the charge density wavetransition at TCDW ≈ 200 K, but more prominently feature a broad peak at a lower Tpeak ∼165 K, which has remained poorly understood despite decades of research on the material. Here we present quantitative simulations of the resistivity using a simplified parametrization of the normal state band structure, based on recent photoemission data. Our simulations reproduce the overall profile of the resistivity of TiSe2, including its prominent peak, without implementing the CDW at all. We find that the peak in resistivity corresponds to a crossover between a low temperature regime with electron-like carriers only, to a regime around room temperature where thermally activated and highly mobile hole-like carriers dominate the conductivity. Even when implementing substantial modifications to model the CDW below the transition temperature, we find that these thermal population effects still dominate the transport properties of TiSe2.
Original languageEnglish
Article number195142
Number of pages9
JournalPhysical Review. B, Condensed matter and materials physics
Volume99
Issue number19
DOIs
Publication statusPublished - 23 May 2019

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