Anomaly in the phase diagram of the spin quantum 1/2 anisotropic Heisenberg antiferromagnet model with Dzyaloshinskii–Moriya interaction: A low temperature analysis

We will study phase diagram the quantum spin-1/2 anisotropic Heisenberg antiferromagnet model in the presence of a Dzyaloshinskii–Moriya interaction (D) and a uniform longitudinal (H) magnetic field, where we have observed an anomaly at low temperatures. Using the effective-field theory with a finit...

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Bibliographic Details
Published in:Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2015-11, Vol.74, p.287-291
Main Authors: Parente, Walter E.F., Pacobahyba, J.T.M., Araújo, Ijanílio G., Neto, Minos A., Ricardo de Sousa, J.
Format: Article
Language:English
Subjects:
Anomalous magnetic behavior
Dzyaloshinskii–Moriya interaction
Low temperature
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Summary:We will study phase diagram the quantum spin-1/2 anisotropic Heisenberg antiferromagnet model in the presence of a Dzyaloshinskii–Moriya interaction (D) and a uniform longitudinal (H) magnetic field, where we have observed an anomaly at low temperatures. Using the effective-field theory with a finite cluster N=2 spin (EFT-2) we calculate the phase diagram in the H–D plane on a simple cubic lattice (z=6). We analyzed the cases: anisotropic Heisenberg – case I: (Δ=1), anisotropic Heisenberg – case II: (Δ=0.5) and anisotropic Heisenberg – case III: (Δ=0), where only second order phase transitions are observed. •Anisotropic Heisenberg antiferromagnet.•Dzyaloshinskii–Moriya interaction.•Anomalous magnetic behavior.
ISSN:1386-9477
1873-1759
DOI:10.1016/j.physe.2015.07.009