Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9841560 | Physica C: Superconductivity and its Applications | 2005 | 10 Pages |
Abstract
Polarized reflectivity measurements were performed on a textured Bi2Sr2Ca2Cu3O10 polycrystal. The far infrared c-axis optical conductivity exhibits similarities with other multilayer superconductors. Namely, a broad band develops around 450Â cmâ1 and nearby phonon anomalies are observed as temperature is decreased. In agreement with lattice dynamics calculation, two oxygen bond-bending modes are found at 362Â cmâ1 and 392Â cmâ1. In contrast with bilayer compounds, this latter phonon mode grows in intensity as temperature decreases. In order to describe quantitatively the appearance of the 450Â cmâ1 peak in the superconducting state, we used the Josephson superlattice model to fit experiments. In this model, the multilayer superconductor is considered as a stack of superconducting layers with non-equivalent intralayer and interlayer Josephson coupling constants. The temperature dependence of the interlayer Josephson coupling energy is extracted from the fit and compared to a possible change in c-axis kinetic energy deduced from an approximate tight-binding sum rule.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
V. Ta Phuoc, V. Garnier, I. Monot-Laffez, F. Gervais,