Artículos de revistas
Field-Tuned Order by Disorder in Frustrated Ising Magnets with Antiferromagnetic Interactions
Fecha
2016-10Registro en:
Guruciaga, Pamela Carolina; Tarzia, M.; Ferreyra, María Victoria; Cugliandolo, Leticia Fernanda; Grigera, Santiago Andrés; et al.; Field-Tuned Order by Disorder in Frustrated Ising Magnets with Antiferromagnetic Interactions; American Physical Society; Physical Review Letters; 117; 16; 10-2016; 1672031-1672035
0031-9007
CONICET Digital
CONICET
Autor
Guruciaga, Pamela Carolina
Tarzia, M.
Ferreyra, María Victoria
Cugliandolo, Leticia Fernanda
Grigera, Santiago Andrés
Borzi, Rodolfo Alberto
Resumen
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.