Spin and lattice effects in the Kondo lattice model

TL;DR

This paper investigates how electron-lattice and Coulomb interactions influence magnetic properties in a one-dimensional Kondo lattice model, revealing inhomogeneities and Griffiths phase behavior affecting spin order.

Contribution

It introduces an extended Kondo lattice model incorporating electron-lattice and Coulomb effects, analyzing their impact on spin inhomogeneities and phase behavior.

Findings

Intrinsic inhomogeneities with Griffiths phase properties emerge

Phonons enhance inhomogeneity formation and disrupt spin order

Inhomogeneities occur on well-defined length scales

Abstract

The magnetic properties of a system of coexisting localized spins and conduction electrons are investigated within an extended version of the one dimensional Kondo lattice model in which effects stemming from the electron-lattice and on-site Coulomb interactions are explicitly included. After bosonizing the conduction electrons, is it observed that intrinsic inhomogeneities with the statistical scaling properties of a Griffiths phase appear, and determine the spin structure of the localized impurities. The appearance of the inhomogeneities is enhanced by appropriate phonons and acts destructively on the spin ordering. The inhomogeneities appear on well defined length scales and can be compared to the formation of intrinsic mesoscopic metastable patterns which are found in two-fluid phenomenologies.