[Zurück]

S. Manalo, H. Michor, G. Hilscher, M. Brühwiler, B. Batlogg:
"Superconducting properties of RbOs₂O₆ analyzed within Eliashberg theory";
Physical Review B, 73 (2006), S. 224520-1 - 224520-7.

Phys. Rev. B 73, 224520 (2006) (7 pages)

Superconducting properties of RbOs₂O<sub>6\ analyzed within Eliashberg theory

S. Manalo, H. Michor, and G. Hilscher
Institute of Solid State Physics, Technische Universität Wien, Wiedner Hauptstraße 8-10, A-1040 Wien, Austria

M. Brühwiler and B. Batlogg
Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland

(Received 27 January 2006; revised 18 April 2006; published 23 June 2006)

Thermodynamic properties such as the specific-heat difference between superconducting and normal states Cs-Cn, the thermodynamic critical field Hc(T), and the upper critical field Hc2(T) of the β-pyrochlore superconductor RbOs2O6 are analyzed within the framework of s-wave Eliashberg theory including anisotropy and scattering effects, yielding a small electron-phonon coupling anisotropy parameter of about <a²k>~=0.005, and a Fermi velocity anisotropy parameter <b²k>~=0.3-0.35. Agreement between theory and experiment is achieved for these parameters, the Sommerfeld coefficient γ, and a model spectral function α²F(ω) consisting of two Einstein peaks and a Debye contribution. A renormalization of the Fermi velocity by an enhancement factor due to electron-electron correlations λee~=1 is considered in the analysis of the experimental Hc2(T) data.

©2006 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v73/e224520

doi:10.1103/PhysRevB.73.224520

PACS: 74.25.Bt, 74.70.Dd, 74.62.-c, 74.20.-z</sub>

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC05938274

http://dx.doi.org/10.1103/PhysRevB.73.224520