Title: Self-consistent approach for magnetic ordering and excited site occupation processes in a two-level system
Author(s):

	M.A. Korynevskii ( Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1Svientsitskii St., 79011 Lviv, Ukraine ; Lviv Polytechnic National University, 12Bandera St., 79013 Lviv, Ukraine ; Institute of Physics of the University of Szczecin, 15Wielkopolska St., 70451 Szczecin, Poland ) ,
	V.B. Solovyan ( Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1Svientsitskii St., 79011 Lviv, Ukraine )

Ferromagnetic ordering in a two-level partially excited system is studied in details. Magnitudes of magnetization (magnetic order parameter) and lattice ordering (excited level occupation number) are calculated self-consistently. The influence of an external magnetic field and excited level gap on the ferromagnetic phase transition is discussed.

Key words: magnetics, two-level system, phase transitions
PACS: 75.10.Hk, 75.30.Cr

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