Observation of a Charge Density Wave Incommensuration Near the Superconducting Dome in CuxTiSe2

A. Kogar, G. A. De La Pena, Sangjun Lee, Y. Fang, S. X.L. Sun, D. B. Lioi, G. Karapetrov, K. D. Finkelstein, J. P.C. Ruff, P. Abbamonte, S. Rosenkranz

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X-ray diffraction was employed to study the evolution of the charge density wave (CDW) in CuxTiSe2 as a function of copper intercalation in order to clarify the relationship between the CDW and superconductivity. The results show a CDW incommensuration arising at an intercalation value coincident with the onset of superconductivity at around x=0.055(5). Additionally, it was found that the charge density wave persists to higher intercalant concentrations than previously assumed, demonstrating that the CDW does not terminate inside the superconducting dome. A charge density wave peak was observed in samples up to x=0.091(6), the highest copper concentration examined in this study. The phase diagram established in this work suggests that charge density wave incommensuration may play a role in the formation of the superconducting state.

Original languageEnglish (US)
Article number027002
JournalPhysical review letters
Issue number2
StatePublished - Jan 11 2017

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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