论文标题
增强的超导性和电子相关性，插入的Zrte $ _3 $
Enhanced Superconductivity and Electron Correlations in Intercalated ZrTe$_3$
论文作者
论文摘要
电荷密度波（CDW）具有超导性，竞争的费米表面不稳定性和集体订单，已引起了人们对二维范德华（VDW）材料的极大兴趣。了解CDW抑制机制，其与新兴超导状态和电子相关性的联系为工程化VDW异质结构和薄膜设备的电子特性提供了机会。使用热传输，X射线光发射光谱，拉曼测量和第一原则计算的组合，我们观察到导电状态的电子相关性增加，因为CDW在ZRTE $ _3 $中抑制了5 \％Cu和Ni Intercation cdw $ _3 $。随着超导性的出现，互嵌件带来了与互相诱导的晶格膨胀的结果，使准二维传导电子与声子的脱钩，但Zr $^{2+} $的急剧增加，以Zr $^{4+} $ Metal Atoms的费用，其Zr $^{2+} $。这些观察结果表明，VDW间隙中原子插入的潜力对基态调整，但也说明了ZR金属价在集体电子订单形成中的关键作用。
Charge density waves (CDWs) with superconductivity, competing Fermi surface instabilities and collective orders, have captured much interest in two-dimensional van der Waals (vdW) materials. Understanding of CDW suppression mechanism, its connection to emerging superconducting state and electronic correlations provides opportunities for engineering the electronic properties of vdW heterostructures and thin film devices. Using combination of the thermal transport, X-ray photoemission spectroscopy, Raman measurements, and first-principle calculations, we observe an increase in electronic correlations of the conducting states as CDW is suppressed in ZrTe$_3$ with 5\% Cu and Ni intercalation in the vdW gap. As superconductivity emerges, intercalation brings decoupling of quasi-one-dimensional conduction electrons with phonons as a consequence of intercalation-induced lattice expansion but also a drastic increase in Zr$^{2+}$ at the expense of Zr$^{4+}$ metal atoms. These observation demonstrate the potential of atomic intercalates in vdW gap for ground state tuning but also illustrate the crucial role of Zr metal valence in formation of collective electronic orders.
