On the Green-function theory of the spin- Heisenberg ferromagnet

1968 ◽  
Vol 46 (9) ◽  
pp. 1021-1028 ◽  
Author(s):  
S. T. Dembinski
Keyword(s):  
Green Function ◽  
Curie Temperature ◽  
Low Temperatures ◽  
Random Phase Approximation ◽  
Function Theory ◽  
Random Phase ◽  
Exact Result ◽  
Heisenberg Ferromagnet ◽  
First Order ◽  
The Green Function

A new first-order decoupling scheme for the Green function appearing in the theory of the spin-[Formula: see text] Heisenberg ferromagnet is introduced. At low temperatures the magnetization has no spurious term in T3 and the coefficient of the term in T4 is within a few percent of the Dyson exact result. The Curie temperature is equal to the random phase approximation Curie temperature.

High-temperature susceptibility of a Heisenberg ferromagnet using Green function theory

1968 ◽  
Vol 46 (12) ◽  
pp. 1502-1504 ◽  
Author(s):  
S. T. Dembinski
Keyword(s):  
High Temperature ◽  
Green Function ◽  
Random Phase Approximation ◽  
Function Theory ◽  
Random Phase ◽  
Heisenberg Ferromagnet ◽  
Zero Field ◽  
Phase Approximation ◽  
First Order ◽  
Temperature Susceptibility

A new first-order decoupling recently proposed, which gave very satisfactory results for the low-temperature magnetization of a Heisenberg [Formula: see text] ferromagnet, is used here to calculate the high-temperature zero-field susceptibility series. The results are close to those known from the random-phase-approximation decoupling.

On the Green function theory of a Heisenberg antiferromagnet

1968 ◽  
Vol 46 (12) ◽  
pp. 1435-1442 ◽  
Author(s):  
S. T. Dembinski
Keyword(s):  
Green Function ◽  
Low Temperature ◽  
Curie Temperature ◽  
Spin Wave ◽  
Function Theory ◽  
Neel Temperature ◽  
Heisenberg Antiferromagnet ◽  
Néel Temperature ◽  
First Order ◽  
The Green Function

Some of the consequences of a recently proposed first-order decoupling are examined in the Green function theory of a [Formula: see text] Heisenberg antiferromagnet. The low-temperature magnetization differs in terms proportional to T4 from Oguchi's spin wave formula. The Neél temperature is equal to the R.P.A, Curie temperature.

The Curie temperature of a Heisenberg-Ising ferromagnet with uniaxial anisotropy

1982 ◽  
Vol 60 (3) ◽  
pp. 273-278 ◽  
Author(s):  
M. Tiwari ◽  
R. N. Srivastava
Keyword(s):  
Green Function ◽  
Curie Temperature ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Uniaxial Anisotropy ◽  
Function Technique ◽  
Phase Approximation ◽  
Ising Ferromagnet ◽  
The Green Function

Effects of Ising anisotropy on Curie temperature have been studied in the presence of single ion anisotropy for a spin S = 1 system. The Green function technique with random phase approximation has been used taking into account all possible intersite correlations.

Structure of liquidHe4at low temperatures: Random-phase approximation

1986 ◽  
Vol 33 (1) ◽  
pp. 635-637 ◽  
Author(s):  
Tapash Chakraborty ◽  
A. Kallio ◽  
M. Puoskari
Keyword(s):  
Low Temperatures ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Phase Approximation
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