1201.3079v2.pdf (1.45 MB)
Quantum magnetism on the Cairo pentagonal lattice
journal contribution
posted on 2018-08-07, 12:51 authored by Ioannis RousochatzakisIoannis Rousochatzakis, Andreas M. Lauchli, R. MoessnerWe present an extensive analytical and numerical study of the antiferromagnetic Heisenberg model on the Cairo pentagonal lattice, the dual of the Shastry-Sutherland lattice with a close realization in the S=5/2 compound Bi2Fe4O9. We consider a model with two exchange couplings suggested by the symmetry of the lattice, and we investigate the nature of the ground state as a function of their ratio x and the spin S. After establishing the classical phase diagram, we switch on quantum mechanics in a gradual way that highlights the different role of quantum fluctuations on the two inequivalent sites of the lattice. The most important findings for S=1/2 include (i) a surprising interplay between a collinear and a four-sublattice orthogonal phase due to an underlying order-by-disorder mechanism at small x (related to an emergent J1-J2effective model with J2J1), and (ii) a nonmagnetic and possibly spin-nematic phase with d-wave symmetry at intermediate x. © 2012 American Physical Society.
History
School
- Science
Department
- Physics
Published in
Physical Review B - Condensed Matter and Materials PhysicsVolume
85Issue
10Citation
ROUSOCHATZAKIS, I., LAUCHLI, A.M. and MOESSNER, R., 2012. Quantum magnetism on the Cairo pentagonal lattice. Physical Review B - Condensed Matter and Materials Physics, 85: 104415Publisher
© American Physical Society (APS)Version
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2012Notes
This paper was accepted for publication in the journal Physical Review B - Condensed Matter and Materials Physics and the definitive published version is available at https://doi.org/10.1103/PhysRevB.85.104415ISSN
1098-0121eISSN
1550-235XPublisher version
Language
- en