Green function theory of a Heisenberg ferromagnet with dipole-octupole interactions

1987 ◽  
Vol 36 (3-4) ◽  
pp. 201-210
Author(s):  
M. Tiwari
Keyword(s):  
Green Function ◽  
Function Theory ◽  
Heisenberg Ferromagnet

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.

Green function theory of a spin- Heisenberg ferromagnet

1969 ◽  
Vol 28 (9) ◽  
pp. 645-646 ◽  
Author(s):  
K. Moorjani ◽  
T. Tanaka
Keyword(s):  
Green Function ◽  
Function Theory ◽  
Heisenberg Ferromagnet

scholarly journals Green-function theory of the Heisenberg ferromagnet in a magnetic field

2004 ◽  
Vol 70 (10) ◽  
Author(s):  
I. Junger ◽  
D. Ihle ◽  
J. Richter ◽  
A. Klümper
Keyword(s):  
Magnetic Field ◽  
Green Function ◽  
Function Theory ◽  
Heisenberg Ferromagnet

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.

HOLE–SPIN COUPLING AND SPIN DISTORTION IN HIGH Tc SUPERCONDUCTORS

1995 ◽  
Vol 09 (24) ◽  
pp. 1589-1594
Author(s):  
M. TIWARI ◽  
R. A. SINGH
Keyword(s):  
Correlation Function ◽  
Green Function ◽  
Low Temperature ◽  
Function Theory ◽  
Expansion Method ◽  
Temperature Series ◽  
Spin Coupling ◽  
High Tc Superconductors ◽  
High Tc ◽  
Series Expansion Method

The effect of hole–spin coupling together with spin distortion on the energy and hole correlation function have been studied in detail. Standard Green function theory and Low Temperature Series Expansion method have been utilised to get analytical results.

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