The interplay among electronic nematicity, charge density wave (CDW), and superconductivity in correlated electronic systems has induced extensive research interest. Here, we discover the existence of nematic fluctuations in a ${\mathrm{TiSe}}_2$ single crystal and investigate its evolution with Cu intercalation. It is observed that the elastoresistivity coefficient $m_{E_g}$ exhibits a divergent temperature dependence following a Curie-Weiss law at high temperature. Similar to the evolution of CDW, upon Cu intercalation, the characteristic temperature $T^{*}$ of nematic fluctuation is progressively suppressed and becomes near zero when the superconductivity is optimized. Further intercalation of Cu leads to the sign change of $T^{*}$ and the suppression of superconductivity. These results indicate an intricate relationship among nematic fluctuations, CDW, and superconductivity in ${\mathrm{Cu}}_x{\mathrm{TiSe}}_2$. Therefore, this system provides a unique material platform to explore the coexistence and competition among multiple symmetry-broken states.

Close

PrevNext

View figure in article

• Charge density waves
• Doping effects
• Nematic order
• Phase transitions by order
• Superconductivity
• Transition metal dichalcogenides