Gaussian Fluctuations of Two Molecular Fields in the Blume-Emery-Griffiths Model

• Authors: W. Jaworski , Z. Jacyna-Onyszkiewicz
• Languages of publication: EN

Abstracts

EN

The Blume-Emery-Griffiths model for spins S=1 in a bilayer with z=5 nearest neighbours is studied with the use of Gaussian fluctuations approximation. The fluctuations of two molecular fields, connected with two order parameters, are introduced. Their influence on phase diagrams for non-negative values of the biquadratic coupling constant is taken under consideration. The results are compared with those obtained by the mean-field approximation and discussed.

Keywords

EN

75.10.Dg; 75.10.Hk; 75.10.Jm

Discipline

• 75.10.Hk: Classical spin models
• 75.10.Dg: Crystal-field theory and spin Hamiltonians(see also 71.70.Ch Crystal and ligand fields)
• 75.10.Jm: Quantized spin models, including quantum spin frustration

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 119
• Issue: 6
• Pages: 846-849

Dates

published

2011-06

received

2010-10-06

(unknown)

2011-01-05

Contributors

author

W. Jaworski

• Quantum Physics Division, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

Z. Jacyna-Onyszkiewicz

• Quantum Physics Division, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

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Identifiers

DOI

10.12693/APhysPolA.119.846