Variational localized‐site cluster expansions. VII. Higher ansätze and the linear heisenberg model
- 1 August 1977
- journal article
- research article
- Published by Wiley in International Journal of Quantum Chemistry
- Vol. 12 (2) , 273-289
- https://doi.org/10.1002/qua.560120205
Abstract
The localized‐site cluster expansion technique is applied to the infinite linear Heisenberg model with both nearest‐neighbor and next nearest‐neighbor interactions. These cluster ansätze are systematically studied and improved, up to the so‐called 5‐site approximation. Generally we find the present cluster ansätze yield the most accurate variational results yet available.Keywords
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