Valence-bond crystal phase of a frustrated spin-1/2 square-lattice antiferromagnet
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.
- Publication:
-
Physical Review B
- Pub Date:
- October 1996
- DOI:
- 10.1103/PhysRevB.54.9007
- arXiv:
- arXiv:cond-mat/9603152
- Bibcode:
- 1996PhRvB..54.9007Z
- Keywords:
-
- 75.10.Jm;
- 75.30.Kz;
- 75.50.Ee;
- Quantized spin models;
- Magnetic phase boundaries;
- Antiferromagnetics;
- Condensed Matter
- E-Print:
- 9 pages, ReVTEX, 2 PS-figures