To the mean-field theory of a two-sublattice antiferromagnet


  • A.A. Zvyagin Max-Planck-Institut für Physik komplexer Systeme, Dresden, D-01187, Germany
  • G.A. Skorobagat`ko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academe of Sciences of Ukraine, 47 Lenin Ave., Kharkov, 61103, Ukraine


Ключові слова:

magnetic sublattice, mean-field approximation, re-entrant phase transitions.


Numerical solutions of the mean-field theory of a two-sublattice antiferromagnet with a strong crystalline electric field are studied. The validity of the solutions was checked with the help of known analytical results for the special case of the lowest doublet (S = 1/2). For larger values of the lowest multiplet (S > 1/2). the temperature and magnetic field dependencies of the antiferromagnetic order parameter and the total magnetization are calculated and their features are analyzed. We predict new re-entrant phase transitions between Néel and paramagnetic phases for S ≥ 1.


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Як цитувати

Zvyagin, A.; Skorobagat`ko, G. To the Mean-Field Theory of a Two-Sublattice Antiferromagnet. Fiz. Nizk. Temp. 2006, 32, 845-852.



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