Valence-bond crystal phase of a frustrated spin-1/2 square-lattice antiferromagnet

1996/03/25 by M. E. Zhitomirsky, Kazuo Ueda · 7 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat

paper · pdf · doi:10.1103/physrevb.54.9007

published as Phys. Rev. B 54, 9007 (1996) · 9 pages, ReVTEX, 2 PS-figures

arxiv created 1996/03/25 · openalex publication_date 1996/10/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We propose a magnetically disordered ground state for a frustrated quantum antiferromagnet. This disordered state is an array of spin singlets spontaneously formed on four spin plaquettes. Both perturbation results and bond-operator calculations show that this phase has lower energy than the columnar dimer state. Analysis of available numerical data on finite clusters also supports the conclusion that this state is realized at intermediate frustrations. \textcopyright 1996 The American Physical Society.

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