Nonuniversality in helical and canted-spin systems

P. Azaria, B. Delamotte, and T. Jolicoeur
Phys. Rev. Lett. 64, 3175 – Published 25 June 1990
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Abstract

Vector-spin models with competing interactions have in general nontrivial ground states which completely break rotational invariance. We study the prototypical stacked triangular Heisenberg antiferromagnet by means of a O(3)×O(2)/O(2) nonlinear σ model in a 2+ε expansion. We find a dynamically generated O(4) symmetry. We propose that such systems in three dimensions have a first-order transition or a second-order one with either N=4 or tricritical mean-field exponents. We argue that this view is supported by experimental and numerical data.

  • Received 15 March 1990

DOI:https://doi.org/10.1103/PhysRevLett.64.3175

©1990 American Physical Society

Authors & Affiliations

P. Azaria

  • Laboratoire de Physique Théorique des Liquides, Université Paris VI, Tour 16, 5 eme étage, F-75252 Paris CEDEX 05, France

B. Delamotte

  • Laboratoire de Physique Théorique et Hautes Energies, Université Paris VI-VII, Tour 24, 5 eme étage, F-75252 Paris CEDEX 05, France

T. Jolicoeur

  • Service de Physique Théorique, Centre d’Etudes Nucleaires de Saclay, F-91191 Gif-sur-Yvette CEDEX, France

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Vol. 64, Iss. 26 — 25 June 1990

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