Chemical trends of superconducting properties in pyrochlore oxides
arXiv:cond-mat/0612682 · doi:10.1016/j.physc.2007.03.023
Abstract
Chemical trends of fundamental superconducting parameters and normal-state properties are described for a family of pyrochlore oxide superconductors. Particularly, the change of Tc from 1.0 K for alpha-pyrochlore Cd2Re2O7 to 3.3 K (A = Cs), 6.3 K (Rb), and 9.6 K (K) for beta-pyrochlore AOs2O6 is discussed on the basis of the conventional BCS scheme. Enhanced Tc and anomalous features observed for KOs2O6 are ascribed to low-energy phonons probably coming from the rattling of the K cations.
8 pages, to be published in the Proceedings of M2S-HTSC2006 (Physica C)