Tuning the charge density wave quantum critical point and the appearance of superconductivity inTiSe2,Physical Review Research

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Tuning the charge density wave quantum critical point and the appearance of superconductivity inTiSe2
Physical Review Research ( IF 3.5 ) Pub Date : 2021-07-28 , DOI: 10.1103/physrevresearch.3.033097
Sangyun Lee _{1,

2,

3} , Tae Beom Park ₁ , Jihyun Kim ₁ , Soon-Gil Jung ₁ , Won Kyung Seong ₁ , Namjung Hur ₄ , Yongkang Luo ₃ , Duk Y. Kim ₂ , Tuson Park ₁

Affiliation

The transition metal dichalcogenide

Ti {Se}_{2}

is an ideal correlated system for studying the interplay between superconductivity (SC) and a charge density wave (CDW) because both symmetry-breaking phases can be easily controlled by either Cu intercalation or physical pressure. SC appears in proximity to a CDW quantum critical point (QCP) induced by both Cu intercalation and applied pressure, raising the possibility of CDW-driven SC. Here, we report tuning the CDW QCP by simultaneously controlling Cu intercalation and external pressure and the appearance of a SC dome centered on the tunable QCP. When subjected to pressure, CDW ordering of Cu-intercalated

{Cu}_{0.025} Ti {Se}_{2}

is completely suppressed at 2.3 GPa, where the residual resistivity and the resistivity-temperature exponent decrease sharply, indicating the presence of the CDW QCP. The upper critical field of

{Cu}_{0.025} Ti {Se}_{2}

is 3.51 kOe, 16 times larger than that of pristine

Ti {Se}_{2}

, and its temperature dependence is linear, indicating that SC of

Ti {Se}_{2}

is switched from the two-dimensional- to anisotropic three-dimensional-like by Cu intercalation. These discoveries show that the simultaneous application of Cu intercalation and pressure move the CDW QCP and that the highest SC transition temperature is pinned to the QCP, suggesting that the SC in

Ti {Se}_{2}

is strongly correlated with CDW quantum criticality.

中文翻译：

调整电荷密度波量子临界点和 TiSe2 中超导性的出现

过渡金属二硫属化物

钛 硒_{2}

是研究超导性 (SC) 和电荷密度波 (CDW) 之间相互作用的理想相关系统，因为这两个对称破坏阶段都可以通过 Cu 嵌入或物理压力轻松控制。SC 出现在由 Cu 嵌入和施加压力引起的 CDW 量子临界点 (QCP) 附近，提高了 CDW 驱动 SC 的可能性。在这里，我们报告了通过同时控制 Cu 嵌入和外部压力以及以可调 QCP 为中心的 SC 圆顶的外观来调整 CDW QCP。当受到压力时，Cu-intercalated 的 CDW 排序