The magnetization curve of the two-dimensional spin-1/2 J1-J2 Heisenberg model is investigated by using the Chern-Simons theory under mean-field approximations. We find that the magnetization curve increases monotonically for J2/J1<0.267949, where the system under zero external field is in the antiferromagnetic Néel phase. For larger ratios of J2/J1, various plateaus will appear in the magnetization curve. In particular, in the disordered phase, our results support the existence of the M/Msat = 1/2 plateau, and predict a plateau at M/Msat = 1/3. Verification of these interesting results would indicate a strong connection between the frustrated antiferromagnetic system and the quantum Hall system.
|Number of pages||6|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2002 Nov 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics