Strong Coulomb effects in hole-doped Heisenberg chains

TL;DR

This paper models hole-doped Heisenberg chains by numerical diagonalization of a Hamiltonian with Coulomb interactions, revealing how magnetic and thermal properties depend on Coulomb screening effects.

Contribution

It introduces a comprehensive numerical approach to incorporate Coulomb effects in hole-doped spin chains, advancing understanding of their spin-charge interplay.

Findings

Magnetic susceptibility is sensitive to Coulomb screening.

Specific heat varies with dielectric constant of Coulomb interaction.

Neutron scattering cross section depends on Coulomb effects.

Abstract

Substances such as the ``telephone number compound'' Sr14Cu24O41 are intrinsically hole-doped. The involved interplay of spin and charge dynamics is a challenge for theory. In this article we propose to describe hole-doped Heisenberg spin rings by means of complete numerical diagonalization of a Heisenberg Hamiltonian that depends parametrically on hole positions and includes the screened Coulomb interaction among the holes. It is demonstrated that key observables like magnetic susceptibility, specific heat, and inelastic neutron scattering cross section depend sensitively on the dielectric constant of the screened Coulomb potential.