Plaquette Resonating-Valence-Bond Ground State of Ca
- 11 March 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 76 (11), 1932-1935
- https://doi.org/10.1103/physrevlett.76.1932
Abstract
A theoretical model is presented to explain the spin gap observed for . The underlying lattice of the 1/5-depleted square lattice favors a formation of the plaquette resonating-valence-bond state. Inclusion of the frustrating second neighbor interaction enhances this tendency, leading to a quantum disordered state of a two-dimensional spin-1/2 Heisenberg model with a sufficiently big spin gap compatible with experiments.
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