Local Structure in Pure and Substitute Thin Films of High Tc Superconductors: an EXAFS Study

YBa_2Cu_3O_7（YBCO）和（La）薄膜的局域结构 Sr）2CuO 4超导体将使用一系列 EXAFS实验。研究了c轴Cu（1）-O（4）和C轴Cu（1）-O（4）的行为。 Cu（2）-O（4）键，因为O被移除并重新引入相同的 样品通过退火将被测量，以确定如何 非谐性随Tc变化。将研究替代样本 了解当地的结构和网站，Jc， 准粒子寿命取决于不同的掺杂剂。这将是 用c轴和a轴膜澄清。更稀的浓度 的Fe，Cu，Ni和Zn在块体YBCO将被调查作为低 浓度制度对于控制或限制 准粒子寿命

The local structure in thin films of YBa2Cu3O7 (YBCO) and (La Sr)2CuO4 superconductors will be investigated using a series of EXAFS experiments. The behavior of the c-axis Cu(1)-O(4) and the Cu(2)-O(4) bonds as O is removed and reintroduced in the same sample via anneals will be measured to determine how the anharmonicity changes with Tc. Substituted samples will be studied to understand how the local structure and site, Jc, and quasiparticle lifetimes depend on different dopants. This will be clarified with c-axis and a-axis films. More dilute concentrations of Fe, Cu, Ni and Zn in bulk YBCO will be investigated as the low concentration regime may be important for controlling or limiting the quasiparticle lifetime.