Condensed Matter Physics, 2015, vol. 18, No. 3, p. 33706
Self-consistent approach for magnetic ordering and excited site occupation processes in a two-level system
( 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 )
( 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.
magnetics, two-level system, phase transitions