Abstract
The two-dimensional spin-gap system shows unique physical properties due to the low-dimensionality character and the strong quantum fluctuations. Experimentally, plateaus have been observed in the magnetization curve under magnetic fields up to 70 T, and the 1/2 plateau is expected to be stabilized at higher magnetic fields. We argue that spin-lattice effects are necessary to describe the spin density profile at the plateaus, and we propose a simple microscopic model of spins interacting adiabatically with the lattice to reproduce the main features of the recent experimental results by nuclear magnetic resonance.
- Received 11 December 2002
DOI:https://doi.org/10.1103/PhysRevB.68.024401
©2003 American Physical Society