Strain-induced charge order in overdoped YBCO thin films

In this proposal we want to focus on the evolution of CDWs with strain, investigating our slightly overdoped, strained, YBCO thin films. By combining our transport data with RIXS, representing the most powerful technique for the detection of CDWs, we aim at correlating the characteristics of the charge order to changes in the crystal structure and transport properties at different thicknesses. A successful identification of CDWs in slightly overdoped YBCO would give the first evidence that the critical doping of charge order can be tuned by strain and therefore by geometrical modification of the unit cell.

在本研究提案中，我们拟聚焦于应变作用下电荷密度波（Charge Density Waves, CDWs）的演化行为，并对我们制备的轻微过掺杂应变钇钡铜氧（Yttrium Barium Copper Oxide, YBCO）薄膜展开研究。通过将输运数据与共振非弹性X射线散射（Resonant Inelastic X-ray Scattering, RIXS）技术相结合——该技术是当前探测电荷密度波的最有效手段——我们旨在建立电荷序的特征与不同厚度下晶体结构及输运特性变化之间的关联。若能在轻微过掺杂钇钡铜氧中成功识别电荷密度波，将首次证实电荷序的临界掺杂浓度可通过应变调控，亦即通过晶胞的几何修饰实现调控。