Europhys. Lett.
Volume 74, Number 6, June 2006
Page(s) 1053 - 1059
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 12 May 2006
Europhys. Lett., 74 (6), pp. 1053-1059 (2006)
DOI: 10.1209/epl/i2005-10591-2

Kondo lattice without Nozières exhaustion effect

K. Kikoin1 and M. N. Kiselev2

1  Ben-Gurion University of the Negev - Beer-Sheva 84105, Israel
2  Institute for Theoretical Physics, University of Würzburg D-97074 Würzburg, Germany

received 17 November 2005; accepted in final form 13 April 2006
published online 12 May 2006

We discuss the properties of layered Anderson/Kondo lattices with metallic electrons confined in 2D xy planes and local spins in insulating layers forming chains in the z direction. Each spin in this model possesses its own 2D Kondo cloud, so that the Nozières' exhaustion problem does not occur. The high-temperature perturbational description is matched to exact low-T Bethe-ansatz solution. The excitation spectrum of the model is gapless both in charge and spin sectors. The disordered phases and possible experimental realizations of the model are briefly discussed.

71.27.+a - Strongly correlated electron systems; heavy fermions.
75.10.Pq - Spin chain models.
75.30.Mb - Valence fluctuation, Kondo lattice, and heavy-fermion phenomena.

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