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Spin glass transition. A dynamical instability
Author(s) -
Deutges D.,
Freudenhammer A.,
Heber G.
Publication year - 1978
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.2220900206
Subject(s) - instability , spin glass , condensed matter physics , phase transition , physics , landau theory , magnetic field , energy functional , spin (aerodynamics) , statistical physics , quantum mechanics , thermodynamics
The instability of a spin glass phase against an external magnetic field is discussed on the basis of a Landau‐type theory of phase transition with two order parameters. There are two different critical magnetic fields, both approaching zero for T → T SG ; the principal meaning of these critical fields is considered. The free energy F ( H, T ) develops different branches as a function of H and T with bifurcations typical for non‐equilibrium phase transitions (or dynamical instabilities).