Field-tuned order by disorder in frustrated Ising magnets with antiferromagnetic interactions
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We demonstrate the appearance of thermal order by disorder in Ising pyrochlores with staggered antiferromagnetic order frustrated by an applied magnetic field. We use a mean-field cluster variational method, a low-temperature expansion, and Monte Carlo simulations to characterize the order-by-disorder transition. By direct evaluation of the density of states, we quantitatively show how a symmetry-broken state is selected by thermal excitations. We discuss the relevance of our results to experiments in 2D and 3D samples and evaluate how anomalous finite-size effects could be exploited to detect this phenomenon experimentally in two-dimensional artificial systems, or in antiferromagnetic all-in-all-out pyrochlores like Nd2Hf2O7 or Nd2Zr2O7, for the first time.
Guruciaga , P C , Tarzia , M , Ferreyra , M V , Cugliandolo , L F , Grigera , S A & Borzi , R A 2016 , ' Field-tuned order by disorder in frustrated Ising magnets with antiferromagnetic interactions ' , Physical Review Letters , vol. 117 , no. 16 , 167203 . https://doi.org/10.1103/PhysRevLett.117.167203
Physical Review Letters
Copyright © 2016, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1103/PhysRevLett.117.167203