Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-12-30
J. Phys. Soc. Jpn, Vol. 67, (1998) 1086
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 Postscript figures, REVTeX, submitted to J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.67.1086
Thermodynamic properties of the one-dimensional Kondo lattice model at half-filling are studied by the density matrix renormalization group method applied to the quantum transfer matrix. Spin susceptibility, charge susceptibility, and specific heat are calculated down to T=0.1t for various exchange constants. The obtained results clearly show crossover behavior from the high temperature regime of nearly independent localized spins and conduction electrons to the low temperature regime where the two degrees of freedom couple strongly. The low temperature energy scales of the charge and spin susceptibilities are determined and shown to be equal to the quasiparticle gap and the spin gap, respectively, for weak exchange couplings.
Ammon Beat
Shibata Naokazu
Sigrist Manfred
Troyer Matthias
Ueda Kazushi
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