Field Induced Ordering in Highly Frustrated Antiferromagnets
2000; American Physical Society; Volume: 85; Issue: 15 Linguagem: Inglês
10.1103/physrevlett.85.3269
ISSN1092-0145
AutoresM. E. Zhitomirsky, A. Honecker, O. A. Petrenko,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoWe predict that an external field can induce a spin ordering in highly frustrated classical Heisenberg magnets. We find analytically stabilization of collinear states by thermal fluctuations at a one-third of the saturation field for kagome and garnet lattices and at a half of the saturation field for pyrochlore and frustrated square lattices. This effect is studied numerically for the frustrated square-lattice antiferromagnet by Monte Carlo simulations for classical spins and by exact diagonalization for S = 1/2. The field induced collinear states have a spin gap and produce magnetization plateaus.
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