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Observation of a Charge Density Wave Incommensuration Near the Superconducting Dome in Cu_{x}TiSe_{2}.

  • Author(s): Kogar, A
  • de la Pena, GA
  • Lee, Sangjun
  • Fang, Y
  • Sun, SX-L
  • Lioi, DB
  • Karapetrov, G
  • Finkelstein, KD
  • Ruff, JPC
  • Abbamonte, P
  • Rosenkranz, S
  • et al.
Abstract

X-ray diffraction was employed to study the evolution of the charge density wave (CDW) in Cu_{x}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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