Intrinsic thermodynamic properties of the pyrochlore superconductor RbOs2O6 extracted by condensation energy analysis
M. Brühwiler, S. M. Kazakov, J. Karpinski, B. Batlogg
DOI 10.1103/PhysRevB.71.214517 · Physical Review B
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Abstract
We develop a general procedure for the analysis of bulk thermodynamic data of a superconductor for samples containing a metallic nonsuperconducting second phase. The method is based on the condensation energy and it allows the extraction of the intrinsic properties of a superconductor even for nonideal samples. Applying this procedure to the recently discovered geometrically frustrated β-pyrochlore superconductor RbOs2O6 (Tc=6.4K) yields a Sommerfeld coefficient as high as 79μJ∕g∕K2 (44mJ∕molf.u.∕K2). RbOs2O6 is inferred to be a strong type-II superconductor [κ(Tc)=23] in the intermediate-coupling regime similar to niobium (λep≈1). From the upper critical field μ0Hc2≈6T at 0K, we estimate a Ginzburg-Landau coherence length ξ≈74Å. The condensation energy is 860μJ∕g (483mJ∕molf.u.) resulting in 1∕(8π)∙(γ1Tc2)∕ΔU1≈0.15, a value well in the range of conventional phonon-mediated superconductors. The superconducting electronic specific heat indicates conventional s-wave pairing. The experimental Sommerfeld coefficient of 44mJ∕molf.u.∕K2 is about four times larger than the one found in band structure calculations. Together with the electron-phonon coupling constant λep≈1 this leaves an additional λadd≈2.1 for enhancement due to other mechanisms.
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 |
| Cd2Re2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CsOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| KOs2O6 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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