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Intrinsic thermodynamic properties of the pyrochlore superconductor RbOs2O6 extracted by condensation energy analysis | | M. Brühwiler
; S.M. Kazakov
; J. Karpinski
; B. Batlogg
; | | Date: |
4 Feb 2005 | | Journal: | Phys. Rev. B 71, 214517 (2005) [http://link.aps.org/abstract/PRB/v71/e214517] | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Abstract: | 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. | | Source: | arXiv, cond-mat/0502125 | | Services: | Forum | Review | PDF | Favorites | |
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