2000/03/31 by M. E. Zhitomirsky, A. Honecker, O. A. Petrenko · 1 citation
Physics and Astronomy · #cond-mat.str-el #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevlett.85.3269
published as Phys. Rev. Lett. 85 (2000) 3269-3273 · 4 pages, new analytical proof the order by disorder by thermal fluctuations is added
arxiv created 2000/07/10 · arxiv updated 2009/11/30
We predict that an external field can induce a spin order 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.