This article is cited in 3 papers

CONDENSED MATTER

On the s-type superconductivity in heavy-fermion compounds

V. V. Val'kov^abc, D. M. Dzebisashvili<sup>ab

a</sup> Krasnoyarsk State Technical University
^b L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences
^c Krasnoyarsk State University

Abstract: The amplitude of scattering of f electrons has been calculated for the periodic Anderson model in the strong-correlation limit (U = ∞) in the Cooper channel. From the condition of the existence of a pole of this amplitude, an equation is derived for determining the critical temperature (T _c) of the transition to the superconducting phase with the s symmetry of the order parameter. The temperature T _c as a function of the electron density and hybridization parameter has been calculated by self-consistently solving the system of equations. The region of the existence of the superconducting phase is found to adjoin the region of the existence of the unsaturated ferromagnetic state and does not overlap it. The results can be used to describe the transition to the superconducting phase with the s symmetry of the order parameter in heavy-fermion skutterudite LaFe₄P₁₂. In this case, the inclusion of the scattering of fermions by spin fluctuations turns out to be substantial enough to obtain T _c values close to the experimental data.

PACS: 71.27.+a, 74.70.Tx

Received: 05.05.2006
Revised: 18.07.2006

 English version: Journal of Experimental and Theoretical Physics Letters, 2006, 84:4, 217–221

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