scholarly journals A mean field theory of magnets with competing double exchange and superexchange interactions

1998 ◽  
Vol 83 (11) ◽  
pp. 7360-7362 ◽  
Author(s):  
D. I. Golosov ◽  
M. R. Norman ◽  
K. Levin
Keyword(s):  
Field Theory ◽  
Mean Field Theory ◽  
Mean Field ◽  
Double Exchange ◽  
Exchange And Superexchange Interactions

scholarly journals TRANSPORT PROPERTIES IN A SIMPLIFIED DOUBLE-EXCHANGE MODEL

2003 ◽  
Vol 17 (01) ◽  
pp. 39-47 ◽  
Author(s):  
VAN-NHAM PHAN ◽  
MINH-TIEN TRAN
Keyword(s):  
Field Theory ◽  
Thermal Conductivity ◽  
Transport Properties ◽  
Thermal Power ◽  
Mean Field Theory ◽  
Mean Field ◽  
Double Exchange ◽  
Exchange Model ◽  
Dynamical Mean Field Theory ◽  
Itinerant Electron

Transport properties of the manganites by the double-exchange mechanism are considered. The system is modeled by a simplified double-exchange model, i.e. the Hund coupling of the itinerant electron spins and local spins is simplified to the Ising-type one. The transport quantities such as the electronic resistivity, the thermal conductivity, and the thermal power are calculated by using the dynamical mean-field theory. The transport quantities obtained qualitatively reproduce the ones observed in the manganites. The results suggest that the simplified double exchange model underlies the key properties of the manganites.

Mean field theory of n-layer unbinding

1993 ◽  
Vol 3 (3) ◽  
pp. 385-393 ◽  
Author(s):  
W. Helfrich
Keyword(s):  
Field Theory ◽  
Mean Field Theory ◽  
Mean Field
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