The J_1-J_2 antiferromagnet with Dzyaloshinskii-Moriya interaction on the square lattice: An exact diagonalization study

Дата и время публикации : 1996-04-11T14:07:54Z

Авторы публикации и институты :
A. Voigt (Universitaet Magdeburg, Germany)
J. Richter (Universitaet Magdeburg, Germany)

Ссылка на журнал-издание: J. Phys.: Condens. Matter 8 (1996) 5059-5069
Коментарии к cтатье: 7 pages, RevTeX, 6 ps-figures, to appear in J. Phys.: Cond. Mat
Первичная категория: cond-mat

Все категории : cond-mat

Краткий обзор статьи: We examine the influence of an anisotropic interaction term of Dzyaloshinskii-Moriya (DM) type on the groundstate ordering of the J_1-J_2 spin-1/2-Heisenberg antiferromagnet on the square lattice. For the DM term we consider several symmetries corresponding to different crystal structures. For the pure J_1-J_2 model there are strong indications for a quantum spin liquid in the region of 0.4 < J_2/J_1 < 0.65. We find that a DM interaction influences the breakdown of the conventional antiferromagnetic order by i) shifting the spin liquid region, ii) changing the isotropic character of the groundstate towards anisotropic correlations and iii) creating for certain symmetries a net ferromagnetic moment.

Category: Physics