Field-Tuned Order by Disorder in Frustrated Ising Magnets with Antiferromagnetic Interactions.
Phys Rev Lett
; 117(16): 167203, 2016 Oct 14.
Article
em En
| MEDLINE
| ID: mdl-27792395
ABSTRACT
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 Nd_{2}Hf_{2}O_{7} or Nd_{2}Zr_{2}O_{7}, for the first time.
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MEDLINE
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En
Ano de publicação:
2016
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Article