Eur. Phys. J. B 45, 311-315 (2005)
https://doi.org/10.1140/epjb/e2005-00200-x

Strong Coulomb effects in hole-doped Heisenberg chains

Universität Osnabrück, Fachbereich Physik, 49069 Osnabrück, Germany

Corresponding author: ^a jschnack@uos.de

Received: 9 February 2005
Revised: 7 April 2005
Published online: 6 July 2005

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.