Issue |
Europhys. Lett.
Volume 39, Number 1, July I 1997
|
|
---|---|---|
Page(s) | 55 - 60 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1997-00313-4 | |
Published online | 01 September 2002 |
Ground-state magnetic properties of the Kondo lattice model at low electron densities
Department of Theoretical Physics,
Royal Institute of Technology,
S-100 44 Stockholm, Sweden
Received:
6
November
1996
Accepted:
25
May
1997
The infinite-size version of the density-matrix renormalization-group
approach in real space is applied to the Kondo lattice model in one
dimension, providing a more accurate determination of the zero-temperature
magnetic properties for electron densities . The paramagnetic state
of the free model evolves
into a state with ferromagnetic correlations, by increasing the strength
of the Kondo coupling, in agreement with previous numerical
results. The change in the magnetic properties
is produced by the competition between the RKKY mechanism, which favours
the paramagnetic state in the weak-coupling region, and the Kondo screening,
which leads to the formation of tightly bound singlets in the strong-coupling
region, enforcing ferromagnetic correlations in the system.
PACS: 71.28.+d – Narrow-band systems; intermediate-valence solids / 75.10.Lp – Band and itinerant models / 75.30.Mb – Valence fluctuation, Kondo lattice, and heavy-fermion phenomena
© EDP Sciences, 1997
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