Spin Waves in Quantum Antiferromagnets

Details Spin Waves in Quantum Antiferromagnets Spin Waves in Quantum Antiferromagnets

1995-06-02

arxiv.org/abs/cond-mat/9506013v1

Europhys. Lett. 31, 37 (1995)

Physics

Condensed Matter

8 pages, uuencoded compressed PS-file, accepted as Euro. Phys. Letter

Scientific paper

10.1209/0295-5075/31/1/007

Using a self-consistent mean-field theory for the $S=1/2$ Heisenberg antiferromagnet Kr\"uger and Schuck recently derived an analytic expression for the dispersion. It is exact in one dimension ($d=1$) and agrees well with numerical results in $d=2$. With an expansion in powers of the inverse coordination number $1/Z$ ($Z=2d$) we investigate if this expression can be {\em exact} for all $d$. The projection method of Mori-Zwanzig is used for the {\em dynamical} spin susceptibility. We find that the expression of Kr\"uger and Schuck deviates in order $1/Z^2$ from our rigorous result. Our method is generalised to arbitrary spin $S$ and to models with easy-axis anisotropy $\D$. It can be systematically improved to higher orders in $1/Z$. We clarify its relation to the $1/S$ expansion.

Affiliated with

Also associated with

No associations

Rating

Spin Waves in Quantum Antiferromagnets 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 Spin Waves in Quantum Antiferromagnets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin Waves in Quantum Antiferromagnets will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-611870