"Selection rule" for irreducible representations inducing second-order phase transitions in magnetic structures

1975 ◽  
Vol 12 (3) ◽  
pp. 1071-1075 ◽  
Author(s):  
A. Michelson
Keyword(s):  
Phase Transitions ◽  
Selection Rule ◽  
Second Order ◽  
Irreducible Representations ◽  
Magnetic Structures

scholarly journals Analysis of magnetic structures of iron nitrides by Landau's theory of second-order phase transitions

AIP Advances ◽  
2013 ◽  
Vol 3 (7) ◽  
pp. 072136 ◽  
Author(s):  
H. N. Fang ◽  
R. Zhang ◽  
B. Liu ◽  
Z. K. Tao ◽  
M. W. Xiao ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Second Order ◽  
Iron Nitrides ◽  
Magnetic Structures

scholarly journals Магнитные фазовые переходы в несоизмеримую магнитную структуру в соединении FeGe-=SUB=-2-=/SUB=-

2019 ◽  
Vol 61 (3) ◽  
pp. 552
Author(s):  
В.В. Меньшенин
Keyword(s):  
Phase Transitions ◽  
Magnetic Structure ◽  
Group Analysis ◽  
Second Order ◽  
Paramagnetic Phase ◽  
Irreducible Representations ◽  
Renormalization Group Analysis ◽  
Space Group ◽  
Incommensurate Structure ◽  
Incommensurate Magnetic Structure

AbstractA symmetry analysis of possible magnetic structures in an incommensurate magnetic phase in FeGe_2 compound, resulted from phase transitions from the paramagnetic phase, was performed based on a phenomenological consideration. It is shown that two possible approaches to a such an analysis, the first of which uses the magnetic representation of the space group, and the second one is based on the expansion of the magnetic moment in basis functions of irreducible representations of the space group of the paramagnetic phase, yield the same results. Space group irreducible representations are determined, according to which the transition to an incommensurate structure can occur. The set of these representations appears identical in both approaches. Ginzburg–Landau functionals for analyzing the transitions according to these representations are written. A renormalization group analysis of the second-order phase transitions from the paramagnetic state to the incommensurate magnetic structure is performed. It is shown that a helical magnetic structure can arise in the incommensurate phase as a result of two second-order phase transitions at the transitions temperature.

Second‐order phase transitions: Models and analogies

1975 ◽  
Vol 43 (10) ◽  
pp. 877-881 ◽  
Author(s):  
Etienne Guyon
Keyword(s):  
Phase Transitions ◽  
Second Order
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