Strong Coulomb effects in hole-doped Heisenberg chains

Details Strong Coulomb effects in hole-doped Heisenberg chains Strong Coulomb effects in hole-doped Heisenberg chains

2004-09-24

arxiv.org/abs/cond-mat/0409650v2

Eur. Phys. J. B 45 (2005) 311-315

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 6 figures, to be published in Eur. Phys. J. B

Scientific paper

10.1140/epjb/e2005-00200-x

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.

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