Abstract
We calculate the uniform magnetization of a spin-1/2 Heisenberg square lattice antiferromagnet at in magnetic fields up to the saturation field in the framework of spin-wave theory including quantum corrections of the second order in . External field generally suppresses zero-point fluctuations, which leads to an upward curvature of the magnetization curve at low fields and logarithmic singularity close to the saturation.
- Received 25 August 1997
DOI:https://doi.org/10.1103/PhysRevB.57.5013
©1998 American Physical Society