Finite temperature strong-coupling expansions for the Kondo lattice model

TL;DR

This paper develops high-order strong-coupling expansions for the Kondo lattice model across multiple dimensions and temperatures, providing detailed predictions for thermodynamic properties like specific heat and susceptibilities.

Contribution

It introduces order $(t/J)^8$ strong-coupling expansions for the Kondo lattice model applicable in 1D, 2D, and 3D at arbitrary temperatures, extending previous lower-order analyses.

Findings

Derived explicit expressions for specific heat and susceptibilities.

Validated the expansions across different dimensions and temperature ranges.

Provided insights into the thermodynamic behavior of strongly correlated electrons.

Abstract

Strong-coupling expansions, to order $(t/J)^8$, are derived for the Kondo lattice model of strongly correlated electrons, in 1-, 2- and 3- dimensions at arbitrary temperature. Results are presented for the specific heat, and spin and charge susceptibilities.