Critical Behaviour of Mixed Heisenberg Chains

Details Critical Behaviour of Mixed Heisenberg Chains Critical Behaviour of Mixed Heisenberg Chains

1996-11-27

arxiv.org/abs/cond-mat/9611227v1

Physics

Condensed Matter

Statistical Mechanics

21 pages, standard LaTex, to appear in J.Phys.A:Math.Gen

Scientific paper

10.1088/0305-4470/30/3/003

The critical behaviour of anisotropic Heisenberg models with two kinds of antiferromagnetically exchange-coupled centers are studied numerically by using finite-size calculations and conformal invariance. These models exhibit the interesting property of ferrimagnetism instead of antiferromagnetism. Most of our results are centered in the mixed Heisenberg chain where we have at even (odd) sites a spin-S (S') SU(2) operator interacting with a XXZ like interaction (anisotropy $\Delta$). Our results indicate universal properties for all these chains. The whole phase, $1>\Delta>-1$, where the models change from ferromagnetic $( \Delta=1 )$ to ferrimagnetic $(\Delta=-1)$ behaviour is critical. Along this phase the critical fluctuations are ruled by a c=1 conformal field theory of Gaussian type. The conformal dimensions and critical exponents, along this phase, are calculated by studying these models with several boundary conditions.

Affiliated with

Also associated with

No associations

Rating

Critical Behaviour of Mixed Heisenberg Chains 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 Critical Behaviour of Mixed Heisenberg Chains, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Critical Behaviour of Mixed Heisenberg Chains will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-175852