Eur. Phys. J. B 34, 275-280 (2003)
https://doi.org/10.1140/epjb/e2003-00222-4

Pre-formed superconducting and quadrupolar fluctuations and heavy electron mass in an exactly solvable model

Institute of Theoretical Physics, Chalmers University of Technology and Göteborg University, 412 96, Göteborg, SwedenB.I. Verkin Institute for Low Temperature Physics and Engineering of the NAS of Ukraine, Kharkov, 61103, Ukraine

Corresponding author: ^a zvyagin@ilt.kharkov.ua

Received: 19 May 2003
Revised: 26 June 2003
Published online: 11 August 2003

Abstract

We present the Bethe ansatz solution for the two-channel non-magnetic hybridization impurity model of electrons with spin and orbital degrees of freedom. It is shown that a small concentration of such impurities enhances the effective mass of electrons. A large concentration of impurities results in a pre-formation of superconducting and quadrupolar-order fluctuations and in the co-existence of them for some range of parameters.