Ising transition driven by frustration in a 2D classical model with continuous symmetry.
- Weber C Institut de Physique Théorique, Université de Lausanne, CH-1015 Lausanne, Switzerland.
- Capriotti L
- Misguich G
- Becca F
- Elhajal M
- Mila F
- 2003-11-13
Published in:
- Physical review letters. - 2003
English
We study the thermal properties of the classical antiferromagnetic Heisenberg model with both nearest (J1) and next-nearest (J2) exchange couplings on the square lattice by extensive Monte Carlo simulations. We show that, for J2/J1>1/2, thermal fluctuations give rise to an effective Z2 symmetry leading to a finite-temperature phase transition. We provide strong numerical evidence that this transition is in the 2D Ising universality class, and that T(c)-->0 with an infinite slope when J2/J1-->1/2.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.91.177202
- PMID 14611373
- Persistent URL
- https://sonar.ch/global/documents/93668
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