High pressure study of charge density wave ordering in BaNi2As2

Recent experiments have revealed the interplay between two charge density wave (CDW) orders and superconductivity in BaNi2As2, a candidate system for charge-driven electronic nematicity. Chemical substitutions have demonstrated the effective tuning of the electronic ground state by chemical pressure and have indicated the unconventional nature of the CDW ordering. Yet, the microscopic origin of the CDWs, their interplay and their association with the underlying nematic instability remain to be clarified. We propose to approach these issues by systematically investigating the effect of hydrostatic pressure (HP) on the crystal structure and the CDW orders of BaNi2As2 using single crystal x-ray diffraction (XRD). Data for the Samples 6,7 and 8.

近期实验揭示了BaNi₂As₂中两种电荷密度波（charge density wave, CDW）序与超导性之间的相互作用，该材料是电荷驱动电子向列性的候选体系。化学替代实验已证明通过化学压力可有效调控电子基态，并表明CDW序具有非常规特性。然而，CDW的微观起源、它们之间的相互作用及其与潜在向列不稳定性的关联仍有待阐明。我们建议通过单晶X射线衍射（single crystal x-ray diffraction, XRD）系统研究静水压力（hydrostatic pressure, HP）对BaNi₂As₂晶体结构和CDW序的影响，以解决这些问题。样品6、7和8的数据。