Intrinsic thermodynamic properties of the pyrochlore superconductor RbOs2O6 extracted by condensation energy analysis

Details Intrinsic thermodynamic properties of the pyrochlore superconductor RbOs2O6 extracted by condensation energy analysis Intrinsic thermodynamic properties of the pyrochlore superconductor RbOs2O6 extracted by condensation energy analysis

2005-02-04

arxiv.org/abs/cond-mat/0502125v1

Phys. Rev. B 71, 214517 (2005) [http://link.aps.org/abstract/PRB/v71/e214517]

Physics

Condensed Matter

Superconductivity

Submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.71.214517

We develop a general procedure for the analysis of bulk thermodynamic data of a superconductor for samples containing a metallic non-superconducting second phase. The method is based on the condensation energy and it allows the extraction of the intrinsic properties of a superconductor even for non-ideal samples. Applying this procedure to the recently discovered geometrically frustrated beta-pyrochlore superconductor RbOs2O6 (Tc = 6.4 K) yields a Sommerfeld coefficient as high as 79 mu J/g/K^2 (44 mJ/mol_f.u./K^2). RbOs2O6 is inferred to be a strong type-II superconductor (kappa(Tc) = 23) in the intermediate-coupling regime similar to niobium (lambda_ep \approx 1). From the upper critical field mu_0 H_c2 \approx 6 T at 0 K, we estimate a Ginzburg-Landau coherence length xi \approx 74 AA. The condensation energy is 860 mu J/g (483 mJ/mol_f.u.) resulting in 1/(8 pi) (gamma_1 Tc^2)/DeltaU_1 \approx 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 44 mJ/mol_f.u./K^2 is about 4 times larger than the one found in band structure calculations. Together with the electron-phonon coupling constant lambda_ep \approx 1 this leaves an additional lambda_add \approx 2.4 for enhancement due to other mechanisms.

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