Chemical trends of superconducting properties in pyrochlore oxides
Zenji Hiroi, Jun-Ichi Yamaura, Shigeki Yonezawa, Hisatomo Harima
TL;DR
This paper analyzes how chemical composition influences superconducting and normal-state properties in pyrochlore oxides, highlighting trends in critical temperature and phonon interactions across different compounds.
Contribution
It provides a systematic description of superconducting parameter trends in pyrochlore oxides, emphasizing the role of low-energy phonons and rattling cations in Tc enhancement.
Findings
Tc increases from 1.0 K in Cd2Re2O7 to 9.6 K in KOs2O6.
Enhanced Tc in KOs2O6 linked to low-energy phonons from K cation rattling.
Normal-state properties show systematic chemical trends.
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.
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