Evidence for s-wave superconductivity in the new beta-pyrochlore oxide RbOs2O6

Abstract

We report the results of 87Rb NMR measurements on RbOs2O6, a new member of the family of the superconducting pyrochlore-type oxides with a critical temperature Tc = 6.4 K. In the normal state, the nuclear spin-lattice relaxation time T1 obeys the Korringa-type relation T1T = constant and the Knight shift is independent of temperature, indicating the absence of strong magnetic correlations. In the superconducting state, T1^{-1}(T) exhibits a tiny coherence enhancement just below Tc, and decreases exponentially with further decreasing temperatures. The value of the corresponding energy gap is close to that predicted by the conventional weak-coupling BCS theory. Our results indicate that RbOs2O6 is a conventional s-wave-type superconductor.

5 pages, 5 figures, submitted to Phys. Rev. B

References in corpus (8)

• Superconductivity at 1 K in Cd2Re2O7
• New Pyrochlore Oxide Superconductor RbOs2O6
• Superconductivity in the Correlated Pyrochlore Cd_2Re_2O_7
• Superconductivity in Geometrically Frustrated Pyrochlore RbOs2O6
• Magnetic and superconducting properties of Cd2Re2O7: Cd NMR and Re NQR
• Pressure effects on the transition temperature and the magnetic field penetration depth in the pyrochlore superconductor RbOs_2O_6
• Temperature Dependence of the Magnetic Penetration Depth in the Vortex State of the Pyrochlore Superconductor, Cd2Re2O7
• Quasiparticle Excitation in the Superconducting Pyrochlore Cd2Re2O7 Probed by Muon Spin Rotation

Cited by in corpus (17)

• Extremely strong-coupling superconductivity and anomalous lattice properties in the beta-pyrochlore oxide KOs2O6
• Rattling-Induced Superconductiviy in the Beta-Pyrochlore Oxides AOs2O6
• Mass enhancement, correlations, and strong coupling superconductivity in the beta-pyrochlore KOs2O6
• Crystal growth, structural studies and superconducting properties of beta-pyrochlore KOs2O6
• Thermal Conductivity of the Pyrochlore Superconductor KOs2O6: Strong Electron Correlations and Fully Gapped Superconductivity
• Study of the magnetic penetration depth in RbOs_2O_6
• Superconductivity in a Molecular Metal Cluster Compound
• Frustration in Coupled Rattler System: KOs2O6
• Uncommonly High Upper Critical Field in the Superconducting KOs${}_2$O${}_6$ Pyrochlore
• Neutron Scattering Study of the Localized Mode in the beta-Pyrochlore Superconductors AOs2O6
• Superconducting Transition in the $\beta$-Pyrochlore AOs${}_2$O${}_6$ (A=Cs, Rb, K) under Pressure
• A Possible Phase Transition in beta-pyrochlore Compounds
• Intrinsic thermodynamic properties of the pyrochlore superconductor RbOs2O6 extracted by condensation energy analysis
• Structural and Superconducting Properties of RbOs2O6 Single Crystals
• Large and homogeneous mass enhancement in the rattling-induced superconductor KOs${}_2$O${}_6$
• Superconductivity and Rattling under High Pressure in the beta-Pyrochlore Oxide RbOs2O6
• Large mass enhancement in RbOs2O6