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Spin-Peierls instabilities of antiferromagnetic rings in a magnetic field

Valeria Lante, Ioannis Rousochatzakis, Karlo Penc, Oliver Waldmann, and Frédéric Mila
Phys. Rev. B 79, 180412(R) – Published 28 May 2009

Abstract

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.

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  • Received 2 March 2009

DOI:https://doi.org/10.1103/PhysRevB.79.180412

©2009 American Physical Society

Authors & Affiliations

Valeria Lante1,2,*, Ioannis Rousochatzakis2, Karlo Penc3, Oliver Waldmann4, and Frédéric Mila2

  • 1Dipartimento di Fisica e Matematica, Università dell’Insubria, Via Valleggio 11, I-22100 Como, Italy
  • 2Institut de Théorie des Phénomènes Physiques, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
  • 3Research Institute for Solid State Physics and Optics, P.O. Box 49, H-1525 Budapest, Hungary
  • 4Physikalisches Institut, Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany

  • *valeria.lante@uninsubria.it

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Issue

Vol. 79, Iss. 18 — 1 May 2009

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