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cond-mat.stat-mech2004
Many-body Green's function theory of ferromagnetic Heisenberg systems with single-ion anisotropies in more than one direction
Huai-Yu Wang, Zhen-Hong Dai, P. Fröbrich +2
The behaviour of ferromagnetic systems with single-ion anisotropies in more than one direction is investigated with many-body Green's function theory generalizing earlier work with…
cond-mat.stat-mech2004
The treatment of zero eigenvalues of the matrix governing the equations of motion in many-body Green's function theory
P. Fröbrich, P. J. Kuntz
The spectral theorem of many-body Green's function theory relates thermodynamic correlations to Green's functions. More often than not, the matrix governing the equations of motion…