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Rattling-induced superconductivity in the beta-pyrochlore oxide RbOs2O6 isinvestigated under high pressures up to 6 GPa. Resistivity measurements in ahigh-quality single crystal show that the superconducting transitiontemperature Tc increases gradually from 6.3 K at ambient pressure to 8.8 K at3.5 GPa, surprisingly remains almost constant at 8.8 \pm 0.1 K in a widepressure range between 3.5 (Po) and 4.8 GPa, and suddenly drops to 6.3 K at Ps= 4.9 GPa, followed by a gradual decrease with further pressure increase. Twoanomalies in the temperature dependence of the normal-state resistivity areobserved at Po < P < Ps and P > Ps, revealing the presence of two high-pressurephases corresponding to the changes in Tc. The rattling of the Rb ion inside acage made of Os and O atoms may be slightly and seriously modified in thesehigh-pressure phases that probably have cages of reduced symmetry,respectively, so that electron-rattler interactions that govern thesuperconducting and transport properties of beta-RbOs2O6 are significantlyaffected.

Superconductivity and Rattling under High Pressure in the beta-Pyrochlore Oxide RbOs2O6