期刊
SCIENCE
卷 316, 期 5823, 页码 425-429出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1138834
关键词
-
Nonequilibrium phase transitions, which are defined by the formation of macroscopic transient domains, are optically dark and cannot be observed through conventional temperature- or pressure-change studies. We have directly determined the structural dynamics of such a nonequilibrium phase transition in a cuprate superconductor. Ultrafast electron crystallography with the use of a tilted optical geometry technique afforded the necessary atomic-scale spatial and temporal resolutions. The observed transient behavior displays a notable structural isosbestic point and a threshold effect for the dependence of c-axis expansion (Delta c) on fluence ( F), with Delta c/F = 0.02 angstrom/(millijoule per square centimeter). This threshold for photon doping occurs at similar to 0.12 photons per copper site, which is unexpectedly close to the density ( per site) of chemically doped carriers needed to induce superconductivity.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据