Evidence for s-wave superconductivity in the β-pyrochlore oxide RbOs2O6
K. Magishi, J. L. Gavilano, B. Pedrini, J. Hinderer, M. Weller, H. R. Ott, S. M. Kazakov, J. Karpinski
DOI 10.1103/PhysRevB.71.024524 · Physical Review B
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Abstract
We report the results of Rb87 NMR measurements on RbOs2O6, a member of the family of the superconducting pyrochlore-type oxides with a critical temperature Tc=6.4K. In the normal state, the nuclear spin-lattice relaxation time T1 obeys the Korringa-type relation T1T=const 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.4 | Pressure not reported | onset |
| RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure not reported | onset |
| Cd2Re2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
| KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.6 | Pressure not reported | unknown |
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