Time-resolved reflectometry on free-standing membranes of SrRuO3

The data in this repository involve time-resolved reflectivity measurements on crystals of nanometric thickness. We use nanoscale acoustic confinement to excite coherent acoustic phonons (dynamical strain) with near-terahertz frequency, and demonstrate that such phonons can easily be excited when breaking the film-substrate epitaxy in the metallic perovskite SrRuO3. Moreover, thermal annealing of the free-standing membranes placed on a substrate with a similar lattice constant dramatically decreases the interfacial acoustic impedance mismatch, evidencing the reformation of chemical bonds and interfacial restructuring.本数据集仓库中的数据为针对纳米厚度晶体的时间分辨反射率测量结果。本研究采用纳米尺度声学约束技术，激发了太赫兹频段附近的相干声学声子（coherent acoustic phonons，即动态应变），并证实：在金属钙钛矿SrRuO3体系中破坏薄膜-衬体外延（epitaxy）时，可轻松激发此类声子。此外，将置于晶格常数相近衬底上的自支撑薄膜进行热退火处理，可显著降低界面声学阻抗失配，这一现象证明了化学键重构与界面重组的发生。