The ferromagnetic transition of iron according to a Landau-theory of phase transitions of second order

1968 ◽  
Vol 216 (5) ◽  
pp. 456-458 ◽  
Author(s):  
Herbert Stenschke
Keyword(s):  
Phase Transitions ◽  
Landau Theory ◽  
Second Order ◽  
Ferromagnetic Transition

Landau theory of second-order phase transitions in ferroelectric films

2001 ◽  
Vol 63 (14) ◽  
Author(s):  
Lye-Hock Ong ◽  
Junaidah Osman ◽  
D. R. Tilley
Keyword(s):  
Phase Transitions ◽  
Landau Theory ◽  
Second Order ◽  
Ferroelectric Films

Possible incommensurate phase in KFeF4

1983 ◽  
Vol 163 (1-2) ◽  
Author(s):  
P. Saint-Gregoire ◽  
A. Perez
Keyword(s):  
Phase Transitions ◽  
Structural Transformation ◽  
Landau Theory ◽  
Second Order ◽  
Incommensurate Phase

AbstractWe analyse in the framework of the Landau theory of second order phase transitions the continuous structural transformation arising in KFeF

NON-EQUILIBRIUM TRICRITICAL BEHAVIOR IN LASERS

1991 ◽  
Vol 05 (04) ◽  
pp. 245-258
Author(s):  
MANSOUR MORTAZAVI ◽  
SURENDRA SINGH
Keyword(s):  
Phase Transitions ◽  
Landau Theory ◽  
Tricritical Point ◽  
Mean Field Theory ◽  
Mean Field ◽  
Second Order ◽  
Operating Parameters ◽  
Threshold Behavior ◽  
Tricritical Behavior ◽  
Non Equilibrium

Tricritical behavior in lasers is reviewed briefly. Threshold behavior in the laser with a saturable absorber is interpreted in terms of first- and second-order phase transitions within the framework of Landau theory (mean field). The intersection of the lines of first- and second order phase transitions in this system provides an example of a non-equilibrium tricritical point. By varying the operating parameters of a He:Ne laser with an intracavity Ne absorber it was possible to operate the laser near the tricritical point. Experimental results are compared with the predictions of mean field theory.

scholarly journals To a Question about First-Order Phase Transitions in Orthoferrites

2016 ◽  
Vol 17 (2) ◽  
pp. 193-197
Author(s):  
O.G. Medvedovs’ka ◽  
G.K. Chepurnykh ◽  
T.O. Fedorenko ◽  
S.V. Sokolov
Keyword(s):  
Magnetic Field ◽  
Phase Transitions ◽  
External Magnetic Field ◽  
Landau Theory ◽  
Second Order ◽  
First Order ◽  
First Order Phase

On the example of first-order phase transitions in orthoferrites under the influence of an external magnetic field is shown the effectiveness of the application of the Landau theory of phase transitions, commonly used in second-order phase transitions. This is especially important when used Hamiltonian is a function of many variables.

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