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- W2064138848 abstract "For the Heisenberg model with random exchange integrals Jij or local fields Hi the application of the commutator and anticommutator Green function is discussed. Because of the different algebraic structure of both Green functions the Tjablikov-decoupling procedure and an approximated structure averaging yield different results. For a Lorentzian distribution of Jij and Hi, where the low energy excitations are localized, the density of states, the magnetization, the susceptibility and the specific heat are investigated by the anticommutator Green function. The commutator Green function fails to work in this case which is adequate for amorphous unsaturated ferromagnets with an inhomogeneous spin structure. We have also discussed the opposite case of an amorphous unsaturated ferromagnet in which the spin structure is homogenized due to extended zero-point fluctuations. The commutator Green function appropriately describes this case while the approximate results of the anticommutator Green function become inadequate." @default.
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- W2064138848 date "1979-01-01" @default.
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- W2064138848 title "Commutator and anticommutator green functions in the theory of disordered spin systems" @default.
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- W2064138848 doi "https://doi.org/10.1016/0378-4363(79)90097-4" @default.
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