Variational localized-site cluster expansions. VII. Higher ansätze and the linear heisenberg model

✍ Scribed by M. A. Garcíaa-bach; D. J. Klein

• Publisher: John Wiley and Sons
• Year: 1977
• Tongue: English
• Weight: 703 KB
• Volume: 12
• Category: Article
• ISSN: 0020-7608
• DOI: 10.1002/qua.560120205

✦ Synopsis

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.