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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 TiSe2 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 Cu0.025TiSe2 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 Cu0.025TiSe2 is 3.51 kOe, 16 times larger than that of pristine TiSe2, and its temperature dependence is linear, indicating that SC of TiSe2 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 TiSe2 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 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0.0252在 2.3 GPa 时被完全抑制,其中残余电阻率和电阻率-温度指数急剧下降,表明 CDW QCP 的存在。上临界场0.0252 是 3.51 kOe,是原始的 16 倍 2,并且其温度依赖性是线性的,表明 SC 的 2通过Cu嵌入从二维到各向异性的三维样。这些发现表明,Cu 嵌入和压力的同时应用会移动 CDW QCP,并且最高的 SC 转变温度固定在 QCP 上,表明 SC 在2 与 CDW 量子临界性密切相关。
更新日期:2021-07-28
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