scholarly journals Nonequilibrium itinerant-electron magnetism: A time-dependent mean-field theory

2016 ◽  
Vol 94 (8) ◽  
Author(s):  
A. Secchi ◽  
A. I. Lichtenstein ◽  
M. I. Katsnelson
Keyword(s):  
Field Theory ◽  
Mean Field Theory ◽  
Mean Field ◽  
Time Dependent ◽  
Itinerant Electron

scholarly journals Regular and chaotic dynamics in time-dependent relativistic mean-field theory

1997 ◽  
Vol 56 (6) ◽  
pp. 6418-6426 ◽  
Author(s):  
D. Vretenar ◽  
P. Ring ◽  
G. Lalazissis ◽  
W. Pöschl
Keyword(s):  
Field Theory ◽  
Chaotic Dynamics ◽  
Mean Field Theory ◽  
Mean Field ◽  
Time Dependent ◽  
Relativistic Mean Field Theory ◽  
Relativistic Mean Field

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.

scholarly journals Linear-Response Time-Dependent Embedded Mean-Field Theory

2017 ◽  
Vol 13 (9) ◽  
pp. 4216-4227 ◽  
Author(s):  
Feizhi Ding ◽  
Takashi Tsuchiya ◽  
Frederick R. Manby ◽  
Thomas F. Miller
Keyword(s):  
Field Theory ◽  
Response Time ◽  
Linear Response ◽  
Mean Field Theory ◽  
Mean Field ◽  
Time Dependent

The nuclear relaxation rate for the itinerant-electron antiferromagnet

1982 ◽  
Vol 60 (5) ◽  
pp. 649-653 ◽  
Author(s):  
M. Crişan ◽  
Zs. Gulácsi
Keyword(s):  
Field Theory ◽  
Relaxation Rate ◽  
Mean Field Theory ◽  
Mean Field ◽  
Band Model ◽  
Itinerant Electron ◽  
Nuclear Relaxation ◽  
The Mean ◽  
Two Band Model ◽  
Good Agreement

The relaxation rate in the nuclear magnetic resonance of the itinerant-electron antiferromagnet was calculated as a function of temperature. A good agreement with the experimental results obtained on CrB2 has been observed. The two band model for the itinerant-electron antiferromagnet for T < TN (TN is the critical temperature) and the mean field theory for the critical region have been used to calculate [Formula: see text] as a function of temperature.

scholarly journals Spin Polarization and Exchange Interaction in a Diluted Magnetic Qunautm Dot

2009 ◽  
Vol 2009 ◽  
pp. 1-7 ◽  
Author(s):  
A. John Peter ◽  
K. Lily Mary Eucharista
Keyword(s):  
Field Theory ◽  
Quantum Dot ◽  
Spin Polarization ◽  
Ionization Energy ◽  
Mean Field Theory ◽  
Mean Field ◽  
Binding Energies ◽  
Spin Interaction ◽  
Itinerant Electron ◽  
Diluted Magnetic

The spin interaction energy of differentMn2+ions with and without an itinerant electron is evaluated for different dot radii. Magnetization is calculated for various concentrations ofMn2+ions with different dot sizes. Spin polaronic shifts are estimated using a mean field theory. The lowest binding energies of electrons in aCd1-xMnxTequantum dot are also calculated. Results are obtained forCd1−xinMnxinTe/Cd1−xoutMnxoutTestructures as a function of the dot radius variationally. It is found that (i) more number ofMn2+spins enhance the spin polaronic effect and it varies linearly with the concentration, (ii) spin polarization ofMn2+ions increases with the concentration for any dot radii, (iii) the magnetization of Mn subsystem increases with the concentration ofMn2+ions and this feature is predominant for smaller dots, and (iv) variation of increase in ionization energy is sharper for smaller dots with increase in concentration. These results are discussed with the available data in literature.

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