A renormalization-group study of the Haldane gap antiferromagnets

Author

Pan, C.Y. ; Lin, H.Q.

Author_Institution

Dept. of Phys., Utah State Univ., Logan, UT, USA

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

4139

Lastpage

4141

Abstract

We have studied anisotropic Heisenberg antiferromagnets by using a real space renormalization-group analysis and exact diagonalization approach. For the spin-1 case, the ground-state energy and Haldane gap at the Heisenberg point are estimated, and they are in good agreement with that obtained by other methods. The critical point is identified where the gap phase changes into a gapless phase. For spin-2 case, the calculated Haldane gap supports a recent prediction suggested by a quantum O(N) nonlinear sigma model study

Keywords

Heisenberg model; antiferromagnetism; magnetic anisotropy; magnetic structure; magnetic transitions; renormalisation; Haldane gap antiferromagnets; anisotropic Heisenberg antiferromagnets; critical point; exact diagonalization; gap phase; gapless phase; ground-state energy; quantum O(N) nonlinear sigma model; renormalization-group; Anisotropic magnetoresistance; Antiferromagnetic materials; High temperature superconductors; Laboratories; Lattices; Magnetic anisotropy; Magnetic properties; Physics; Predictive models; Roentgenium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.489887

Filename

489887