scholarly journals Implications of the low-temperature instability of dynamical mean-field theory for double-exchange systems

2005 ◽  
Vol 72 (24) ◽  
Author(s):  
Chungwei Lin ◽  
Andrew J. Millis
Keyword(s):  
Field Theory ◽  
Low Temperature ◽  
Mean Field Theory ◽  
Mean Field ◽  
Double Exchange ◽  
Dynamical Mean Field Theory ◽  
Temperature Instability

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.

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