Temperature Dependence of Spin-Wave Energy in thet-Matrix Approximation

1970 ◽  
Vol 2 (1) ◽  
pp. 167-175 ◽  
Author(s):  
W. Young
Keyword(s):  
Temperature Dependence ◽  
Spin Wave ◽  
Wave Energy ◽  
Matrix Approximation

Introduction of renormalization factor for spin-wave energy into Bogolyubov-Tyablikov theory

1995 ◽  
Vol 102 (2) ◽  
pp. 219-223
Author(s):  
V. A. Bamburov ◽  
A. A. Kazakov ◽  
V. N. Frolov
Keyword(s):  
Spin Wave ◽  
Wave Energy ◽  
Renormalization Factor

Temperature Dependence of the Exchange Splitting in Ferromagnetic Metals II. The Study of Stoner Excitations by the de Haas–van Alphen Effect

1974 ◽  
Vol 52 (8) ◽  
pp. 704-707 ◽  
Author(s):  
D. M. Edwards
Keyword(s):  
Temperature Dependence ◽  
Spin Wave ◽  
Itinerant Electron ◽  
Exchange Splitting ◽  
Ferromagnetic Metals

It is shown that the de Haas–van Alphen (dHvA) effect in ferromagnetic metals can give information about the Stoner T2 term in the temperature dependence of the magnetization, without interference from spin wave contributions. In particular, the temperature dependence of the dHvA frequency for a very weak itinerant electron ferromagnet could distinguish clearly between conflicting theories of these materials.

The temperature dependence of the spin wave energy in the itinerant electron model of ferromagnetism

1968 ◽  
Vol 302 (1470) ◽  
pp. 409-418 ◽  
Keyword(s):  
Spin Wave ◽  
Wave Energy ◽  
Short Range ◽  
Distribution Functions ◽  
Itinerant Electron ◽  
Short Range Interaction ◽  
Range Interaction ◽  
Electron Model ◽  
Long Wavelength ◽  
Chemical Potentials

The long wavelength non-interacting spin wave energy for metals at low temperatures is expressed as ћω q = Dq 2 = ( D 0 + D 1 T 2 ) q 2 . The dependence of the coefficient D 1 on the density of states function, the number of electrons per atom, n , and the effective short range interaction energy, I , is discussed. The variation of D with T 2 comes from the change with temperature of the relative occupation ζ and the chemical potentials of the ± spin sub-bands as well as from the direct asymptotic expansion of the Fermi distribution functions occurring in the expression for D .

THE 2-d HEISENBERG MODEL WITH VARIOUS TYPES OF INTERACTIONS: TEMPERATURE DEPENDENCE OF MAGNETIC PARAMETERS AND THE PHASE TRANSITION TEMPERATURE

1993 ◽  
Vol 07 (01n03) ◽  
pp. 504-507
Author(s):  
N. GARCIA ◽  
A. LEVANYUK ◽  
P. SERENA
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Temperature Dependence ◽  
Spin Wave ◽  
Phase Transition Temperature ◽  
Heisenberg Model ◽  
Wave Theory ◽  
Ferromagnetic Phase ◽  
Temperature Perturbation ◽  
Spin Wave Theory

Using the low-temperature perturbation (spin wave) theory we calculate the temperature dependence of anisotropy constant, spin-wave stiffness, spontaneous magnetization for a two-dimensional ferromagnetic Heisenberg model with various types of anisotropy and interactions. We found that the Polyakov renormalization procedure is inapplicable for ferromagnetic phase at any anisotropy. We did not find the reorientation phase transition due to dipole-dipole interaction predicted by Pescia and Pokrovsky. Taking into account the spin flips we obtained a phase transition temperature in good agreement with results of our Monte Carlo calculations. These results demonstrate also the effectiveness of the spin wave theory.

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