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

利用一系列的EXAFS实验研究了YBa2Cu3O7 （YBCO）和（La Sr）2CuO4超导体薄膜中的局部结构。c轴Cu(1)-O(4)和Cu(2)-O(4)键的行为将被测量，当O通过退火在同一样品中被去除和重新引入时，以确定不谐性如何随Tc变化。将研究取代的样品，以了解局部结构和位置，Jc和准粒子寿命如何取决于不同的掺杂剂。这将通过c轴和a轴薄膜来阐明。由于低浓度对控制或限制准粒子寿命可能很重要，因此将研究块状YBCO中更稀浓度的Fe、Cu、Ni和Zn。

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.