Heisenberg model with Dzyaloshinskii-Moriya interaction: A Schwinger boson study

Details Heisenberg model with Dzyaloshinskii-Moriya interaction: A Schwinger boson study Heisenberg model with Dzyaloshinskii-Moriya interaction: A Schwinger boson study

1996-11-14

arxiv.org/abs/cond-mat/9611116v1

Physics

Condensed Matter

Statistical Mechanics

9 text pages, Latex, 10 figures included as eps files, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.54.12946

We present a Schwinger-boson approach to the Heisenberg model with Dzyaloshinskii-Moriya interaction. We write the anisotropic interactions in terms of Schwinger bosons keeping the correct symmetries present in the spin representation, which allows us to perform a conserving mean-field approximation. Unlike previous studies of this model by linear spin-wave theory, our approach takes into account magnon-magnon interactions and includes the effects of three-boson terms characteristic of noncollinear phases. The results reproduce the linear spin-wave predictions in the semiclassical large-S limit, and show a small renormalization in the strong quantum limit S=1/2. For the sake of definiteness, we specialize the calculations for the pattern of Moriya vectors corresponding to the orthorhombic phase in La_2CuO_4, and give a fairly detailed account of the behavior of ground-state energy, anisotropy gap, and net ferromagnetic moment. In the last part of this work we generalize our approach to describe the geometry of the intermediate phase in La_{2-x}Nd_xCuO_4, and discuss the effects of including nondegenerate 2p_z oxygen orbitals in the calculations.

Affiliated with

Also associated with

No associations

Rating

Heisenberg model with Dzyaloshinskii-Moriya interaction: A Schwinger boson study does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Heisenberg model with Dzyaloshinskii-Moriya interaction: A Schwinger boson study, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heisenberg model with Dzyaloshinskii-Moriya interaction: A Schwinger boson study will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-352493