INVESTIGADORES
LAMAS Carlos Alberto
artículos
Título:
Effective field theory approach for the S = 3 2 bilayer honeycomb antiferromagnet
Autor/es:
C. A LAMAS; ACEVEDO, S.; P. PUJOL
Revista:
PHYSICAL REVIEW B
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2021 vol. 104 p. 214412 - 214419
ISSN:
1098-0121
Resumen:
The spin-3/2 Heisenberg antiferromagnet on the bilayer honeycomb lattice is a minimal model to describe the magnetic behavior of Bi3Mn4O12(NO3). We study this model with frustrating interlayer second-neighbor couplings taking into account quantum and thermal fluctuations. We use a path integral formulation in terms of coherent states to describe the low-energy physics of the model. We show that for a particular point in the parameter space, close to the experimental estimated couplings, a continuum classical degeneracy is lifted by both quantum and thermal fluctuations, and a collinear state is then selected by an order by disorder mechanism. Our results provide a global perspective in the understanding of the experimental observations.