Thermodynamic properties of the one-dimensional Kondo insulators studied by the density matrix renormalization group method

Abstract

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.

4 pages, 3 Postscript figures, REVTeX, submitted to J. Phys. Soc. Jpn

References in corpus (6)

• Thermodynamics of the anisotropic Heisenberg chain calculated by the density matrix renormalization group method
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• Spin and charge gaps in the one-dimensional Kondo-lattice model with Coulomb interaction between conduction electrons
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• Thermodynamics of doped Kondo insulator in one dimension: Finite Temperature DMRG Study
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• Low-energy excitations and transport functions of the one-dimensional Kondo insulator
• Finite temperature strong-coupling expansions for the Kondo lattice model
• Thermodynamics of the half-filled Kondo lattice model around the atomic limit