Abstract
We discuss a systematic, microscopic calculation of the spin-stiffness constants for the spin-(1/2 square-lattice Heisenberg antiferromagnet. An infinitesimal twist is imposed upon the system by gradually rotating the direction of antiferromagnetic ordering. The difference in the ground-state energy of this system with respect to the uniformly ordered ground state can be related to the spin-stiffness constants. Series expansions and extrapolation for the energy of the twisted system lead to the estimate &s/J)=0.720.0. The ratio of the series for s and perpendicular susceptibility leads to an estimate for the spin-wave &(=cs/ 2 J)=1.180.02. The experiments on La2CuO4 are quantitatively consistent with a nearest-neighbor Heisenberg model when one takes into account these quantum renormalizations.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 7247-7251 |
| Number of pages | 5 |
| Journal | Physical Review B |
| Volume | 40 |
| Issue number | 10 |
| DOIs | |
| State | Published - 1989 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics