Letter to the Editor

Ground state properties of an anisotropic Heisenberg model

Darko V. Kapora ; Institute of Physics, Faculty of Sciences, Dr I. Đuričića 4, 21000 Novi Sad, Yugoslavia
Katarina R. Surla ; Institute of Mathematics, Faculty of Sciences, Dr I. Duričića 4, 21000 Novi Sad, Yugoslavia
Dušan I. Surla ; Institute of Mathematics, Faculty of Sciences, Dr I. Duričića 4, 21000 Novi Sad, Yugoslavia
Jovan P. Šetrajčić ; Institute of Physics, Faculty of Sciences, Dr I. Đuričića 4, 21000 Novi Sad, Yugoslavia
Mario J. Škrinjar ; Institute of Physics, Faculty of Sciences, Dr I. Đuričića 4, 21000 Novi Sad, Yugoslavia

Abstract

Energy gap and spin deviation in the ground state of an anisotropic Heisenberg model are expanded in terms of small anisotropy parameter up to the fourth power of the anisotropy parameter. It is shown that the fourth-order terms in Bose¬-operators give much more significant contribution than it was previously estimated.

Keywords

Hrčak ID:

328936

URI

https://hrcak.srce.hr/328936

Publication date:

5.12.1983.

Article data in other languages: serbian

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