1993/12/21 by Oleg Starykh, George Reiter · 1 citation
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physrevb.49.4368
REVTEX 3.0, 6 pages, TCSUH 93:085, 3 figures are available upon request from [email protected]
arxiv created 1993/12/21 · arxiv updated 2009/11/30
Starting from the CPN-1 model description of the thermally disordred phase of the D=2 quantum antiferromagnet, we examine the interaction of the Schwinger-boson spin-1/2 mean-field excitations with the generated gauge (chirality) fluctuations in the framework of the 1/N expansion. This interaction dramatically supresses the one-particle motion, but enhances the staggered static susceptibility. This means that actual excitations in the system are represented by the collective spin-1 excitations, whereas one-particle excitations disappear from the problem. We also show that massive fluctuations of the constraint field are significant for the susceptibility calculations. A connection with the problem of a particle in random magnetic field is discussed.