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Spin-Peierls instabilities of antiferromagnetic rings in a magnetic field

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journal contribution
posted on 09.08.2018, 09:09 by Valeria Lante, Ioannis Rousochatzakis, Karlo Penc, O Waldmann, Frederic Mila
Motivated 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 Physics

Volume

79

Issue

18

Citation

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

2009

Notes

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.79.180412

ISSN

1098-0121

eISSN

1550-235X

Language

en

Exports

Loughborough Publications

Keywords

Exports