25 citations · 100 across the 14 of their papers we have counts for
14 papers
Transversal transport of magnons in a modified Lieb lattice
P. G. de Oliveira, A. S. T. Pires
We studied a two-band magnon insulating model whose geometry is that of a modified Lieb lattice in which one of the sites was removed. Anisotropic ferromagnetic exchange interactio…
Spin- ferromagnetic Heisenberg model with an easy-plane crystal field on the cubic lattice: A bosonic approach
D. C. Carvalho, A. S. T. Pires, L. A. S. Mól
We examine the phase diagram of the spin- ferromagnetic Heisenberg model with an easy-plane crystal field on the cubic lattice, in which is the ferromagnetic…
Phase transitions in the two-dimensional Anisotropic Biquadratic Heisenberg Model
Antônio R. Moura, Antônio S. T. Pires, Afrânio R. Pereira
In this paper we study the influence of the single-ion anisotropy in the two-dimensional biquadratic Heisenberg model (ABHM) on the square lattice at zero and finite low temperatur…
Vortex core dynamics induced by hole defects in antiferromagnetic nanodisks
R. L. Silva, R. D. Pereira, A. R. Pereira +3
Direct observation of vortex states in an antiferromagnetic layer have been recently reported [Wu, et al, Nature Phys. 7, 303 (2011)]. In contrast to their analogues in ferromagnet…
Phase diagram of the antiferromagnetic XY model in two dimensions in a magnetic field
A. S. T. Pires, B. V. Costa, R. A. Dias
The phase diagram of the quasi-two-dimensional easy-plane antiferromagnetic model, with a magnetic field applied in the easy plane, is studied using the self-consistent harmonic ap…
Nonlinear sigma model of a spin ladder containing a static single hole
A. R. Pereira, E. Ercolessi, A. S. T. Pires
In this letter we extend the nonlinear sigma model describing pure spin ladders with an arbitrary number of legs to the case of ladders containing a single static hole. A simple im…