Observation of a Charge Density Wave Incommensuration Near the Superconducting Dome in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Cu</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>TiSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mrow></mml:math>

Anshul Kogar, G. A. de la Peña, Sangjun Lee, Y. Fang, Stella Sun, David B. Lioi, G. Karapetrov, K. D. Finkelstein, Jacob P. C. Ruff, Peter Abbamonte

Abstract

X-ray diffraction was employed to study the evolution of the charge density wave (CDW) in ${\mathrm{Cu}}_{x}{\mathrm{TiSe}}_{2}$ 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.

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