Comments on the use of the Landau theory in some order-order transitions

摘要: Abstract The application of the Landau theory phase transitions to a two-sublattice magnet results in broad range magnetic transitions. use two-component order parameter enables one describe both order-disorder and order-order In particular, metamagnetic exhibit thermal hysteresis. It is shown that Kittel model special case expansion. Finally, an alternative one-component expansion discussed.