Observation of a Charge Density Wave Incommensuration Near the Superconducting Dome in Cu$_{\mathrm{x}}$TiSe$_{\mathrm{2}}$
ORAL
Abstract
X-ray diffraction was employed to study the evolution of the charge density wave (CDW) in Cu$_{\mathrm{x}}$TiSe$_{\mathrm{2}}$ 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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