Superconductivity in the geometrically frustrated pyrochlore RbOs2O6
M. Brühwiler, S. M. Kazakov, N. D. Zhigadlo, J. Karpinski, B. Batlogg
DOI 10.1103/PhysRevB.70.020503 · Physical Review B
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Abstract
We report the basic thermodynamic properties of the geometrically frustrated β-pyrochlore bulk superconductor RbOs2O6 with a critical temperature Tc=6.4K. Specific heat measurements are performed in magnetic fields up to 12T. The electronic density of states at the Fermi level in the normal state results in γ=(33.7±0.2)mJ∕molf.u.∕K2. In the superconducting state, the specific heat follows conventional BCS-type behavior down to 1K, i.e., over three orders of magnitude in specific heat data. The upper critical field slope at Tc is 1.2T∕K, corresponding to a Maki-parameter α=0.64±0.1. From the upper critical field μ0Hc2≈6T at 0K, we estimate a Ginzburg-Landau coherence length ξ≈74Å. RbOs2O6 is the second reported metallic AB2O6 type pyrochlore compound after KOs2O6, and one of only three pyrochlore superconductors in addition to Cd2Re2O7 and KOs2O6.
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 | unknown |
| 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 |
| KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Cd2Re2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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