Superconductivity

Influence of triplet states on the spectrum of collective spin-polaron excitations in a 2D Kondo lattice

V. V. Val'kov^ab, A. A. Shklyaev^a, M. M. Korovushkin^a, A. F. Barabanov<sup>c

a</sup> L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b M. F. Reshetnev Siberian State Aerospace University,
^c Institute for High Pressure Physics, Russian Academy of Sciences

Abstract: The normal and superconducting phases of the ensemble of spin polarons in a two-dimensional Kondo lattice have been considered under the conditions when the hopping integral is comparable to the $s$–$d$ exchange interaction energy. The polaron excitation spectrum and the superconducting transition temperature have been found taking into account upper triplet states. The change in the concentration dependence of the critical temperature of the transition to the superconducting phase with the relation between the hopping integral and the integral of the $s$–$d$ exchange coupling has been analyzed.

Received: 05.04.2011

 English version: Physics of the Solid State, 2011, 53:10, 1997–2000

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