New beta-Pyrochlore Oxide Superconductor CsOs2O6
Shigeki Yonezawa, Yuji Muraoka, Zenji Hiroi
TL;DR
This paper reports the discovery of a new beta-pyrochlore oxide superconductor CsOs2O6 with a transition temperature of 3.3 K, expanding the family of known beta-pyrochlore superconductors and exploring the relationship between ionic size and Tc.
Contribution
It introduces CsOs2O6 as the third beta-pyrochlore superconductor and analyzes how ionic radius affects its superconducting transition temperature.
Findings
CsOs2O6 is a new superconductor with Tc = 3.3 K.
Superconducting transition temperature decreases with increasing ionic radius.
The series shows a trend of decreasing Tc from K to Cs.
Abstract
The discovery of a new beta-pyrochlore oxide superconductor CsOs2O6 with Tc = 3.3 K is reported. It is the third superconductor in the family of beta-pyrochlore oxides, following KOs2O6 with Tc = 9.6 K and RbOs2O6 with Tc = 6.3 K. The Tc of this series decreases with increasing the ionic radius of alkaline metal ions, imposing negative chemical pressure upon the Os pyrochlore lattice.
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