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Download fileSpin-Peierls instabilities of antiferromagnetic rings in a magnetic field
journal contribution
posted on 2018-08-09, 09:09 authored by Valeria Lante, Ioannis RousochatzakisIoannis Rousochatzakis, Karlo Penc, O Waldmann, Frederic MilaMotivated by the intriguing properties of magnetic molecular wheels at field-induced level crossings, we investigate the spin-Peierls instability of antiferromagnetic rings in a field by exact diagonalizations of a microscopic spin model coupled to the lattice via a distortion-dependent Dzyaloshinskii-Moriya interaction. We show that, beyond the unconditional instability at level crossings for infinitesimal magnetoelastic coupling, the model is characterized by a stronger tendency to distort at higher level crossings and by a dramatic angular dependence with very sharp torque anomalies when the field is almost in the plane of the ring. These predictions are shown to compare remarkably well with available torque and nuclear magnetic resonance data on CsFe8. © 2009 The American Physical Society.
Funding
This work was supported by the Swiss National Fund, by MaNEP, by the Hungarian OTKA Grants No.K62280 and No.K68807, and the ESF HFM project (Exchange Grant 1273).
History
School
- Science
Department
- Physics
Published in
Physical Review B - Condensed Matter and Materials PhysicsVolume
79Issue
18Citation
LANTE, V. ... et al., 2009. Spin-Peierls instabilities of antiferromagnetic rings in a magnetic field. Physical Review B - Condensed Matter and Materials Physics, 79: 180412(R).Publisher
© 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
2009Notes
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.79.180412ISSN
1098-0121eISSN
1550-235XPublisher version
Language
- en