Department of Physics Papers
Document Type
Journal Article
Date of this Version
5-1-1996
Publication Source
Physical Review B
Volume
53
Issue
17
Start Page
11661
Last Page
11670
DOI
10.1103/PhysRevB.53.11661
Abstract
This paper derives the anisotropic superexchange interactions from a Hubbard model for excitations within the copper 3d band and the oxygen 2p band of the undoped insulating cuprates. We extend the recent calculation of Yildirim et al. [Phys. Rev. B 52, 10 239 (1995)] in order to include the most general on-site Coulomb interactions (including those which involve more than two orbitals) when two holes occupy the same site. Our general results apply when the oxygen ions surrounding the copper ions form an octahedron which has tetragonal symmetry (but may be rotated as in lanthanum cuprate). For the tetragonal cuprates we obtain an easy-plane anisotropy in good agreement with experimental values. We predict the magnitude of the small in-plane anisotropy gap in the spin-wave spectrum of YBa2Cu3O6.
Recommended Citation
Entin-Wohlman, O., Harris, A., & Aharony, A. (1996). Magnetic Anisotropies and General On-Site Coulomb Interactions in the Cuprates. Physical Review B, 53 (17), 11661-11670. http://dx.doi.org/10.1103/PhysRevB.53.11661
Date Posted: 12 August 2015
This document has been peer reviewed.
Comments
At the time of publication, author A. Brooks Harris was also affiliated with Tel Aviv University, Tel Aviv, Israel. Currently, he is a faculty member in the Physics Department at the University of Pennsylvania.