I use the two-step density-matrix renormalization group method to extract the critical exponents β and ν in the transition from a Néel Q=(π,π) phase to a magnetically disordered phase with a spin gap. I find that the exponent β computed from the magnetic side of the transition is consistent with that of the classical Heisenberg model, but not the exponent zν computed from the disordered side. This suggests a possible discrepancy with the classical behavior. I also show the contrast between integer and half-integer spin cases.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 18 Mar 2008|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics