| Issue |
Europhys. Lett.
Volume 46, Number 1, April I 1999
|
|
|---|---|---|
| Page(s) | 88 - 93 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1999-00552-9 | |
| Published online | 01 September 2002 | |
Hubbard chain with a Kondo impurity
Institut de Physique Théorique,
École Polytechnique Fédérale de Lausanne CH-1015 Lausanne
Received:
19
October
1998
Accepted:
15
January
1999
A Bethe ansatz solution of a (modified) Hubbard chain with a Kondo impurity of
arbitrary spin S at a
highly symmetric line of parameter space is proposed and explored.
Our results confirm the
existence of a strong-coupling (line of) fixed-point(s) with ferromagnetic
Kondo coupling
as first hypothetized by Furusaki and
Nagaosa on the basis of perturbative renormalization group calculations.
For on-site Hubbard repulsion and
ferromagnetic Kondo exchange, the ground state has spin 
,
i.e., is a singlet when S=1/2.
The contributions of the
impurity to the magnetic susceptibility and low-temperature
specific heat are discussed.
While the Wilson ratio is unity in the half-filled band,
it is found to be a
function of density and interaction away from half-filling.
PACS: 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions / 72.15.Qm – Scattering mechanisms and Kondo effect
© EDP Sciences, 1999
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