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
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.
PACS: 75.30.Mb – Valence fluctuation, Kondo lattice, and heavy-fermion phenomena / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
