Negative Impurity Magnetic Susceptibility and Heat Capacity in a Kondo Model with Narrow Peaks in the Local Density of Electron States

Abstract

Temperature dependencies of the impurity magnetic susceptibility, entropy, and heat capacity have been obtained by the method of numerical renormalization group and exact diagonalization for the Kondo model with peaks in the electron density of states near the Fermi energy (in particular, with logarithmic Van Hove singularities). It is shown that these quantities can be {\it negative}. A new effect has been predicted (which, in principle, can be observed experimentally), namely, the decrease in the magnetic susceptibility and heat capacity of a nonmagnetic sample upon the addition of magnetic impurities into it.

References in corpus (2)

• The numerical renormalization group method for quantum impurity systems
• Nonperturbative Scaling Theory of Free Magnetic Moment Phases in Disordered Metals

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• One- and two-channel Kondo model with logarithmic Van Hove singularity: a numerical renormalization group solution
• Flat-Band Driven Kondo Breakdown and Reentrant Effects in Heavy-Fermion Moiré Superlattices
• Quantum impurity with 2/3 local moment in 1D quantum wires: an NRG study