Strong Coulomb effects in hole-doped Heisenberg chains

Autor(en): Schnack, J 
Stichwörter: ELECTRON CORRELATIONS; GAP; INSULATOR; NARROW ENERGY BANDS; Physics; Physics, Condensed Matter; SPIN DYNAMICS; SR14CU24O41; STATE; SUPERCONDUCTIVITY
Erscheinungsdatum: 2005
Herausgeber: SPRINGER
Journal: EUROPEAN PHYSICAL JOURNAL B
Volumen: 45
Ausgabe: 3
Startseite: 311
Seitenende: 315
Zusammenfassung: 
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.
ISSN: 14346028
DOI: 10.1140/epjb/e2005-00200-x

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