Premium
Landau Model of a Spin Glass with Two Order Parameters: Stability and Derived Physical Properties I. Stability
Author(s) -
Deutges D.,
Heber G.
Publication year - 1980
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221010230
Subject(s) - condensed matter physics , spin glass , ferromagnetism , landau theory , phase transition , magnetization , stability (learning theory) , paramagnetism , spin (aerodynamics) , specific heat , phase (matter) , materials science , physics , magnetic field , thermodynamics , quantum mechanics , machine learning , computer science
A Landau‐type theory of phase transitions with two order parameters is used to describe modificated ferromagnetic and spin glass phases. Phase transitions to “normal” ferromagnetic or paramagnetic states are investigated. We shall be interested mainly in the conditions of stability and the resulting consequences for the choice of coefficients in the Landau free energy. The critical behaviour of the modificated ferromagnetic and spin glass phases against external magnetic fields is shown. Physical properties as susceptibility, magnetization, and specific heat are deduced by chosing suitable linear temperature dependences of the coefficients of the free energy. The competing phases are considered.