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[en] The low-temperature behaviour of an anisotropic Heisenberg model is examined in the Dyson-Maleev Boson representation by Green's functions method. Special attention is paid to the anisotropy effects: energy gap and spin deviation. The are expressed in terms of a set of auxilliary functions, whose symmetry properties are employed in order to evaluate the self-consistent set of equations for these functions. (author)
Journal
Zbornik Radova Prirodno-Matematickog Fakulteta. Serija za Fiziku; ISSN 0352-0889; 
; v. 12 p. 15-22
; v. 12 p. 15-22