Abstract
Motivated by the ongoing investigation of SrCu(BO) under pressure, we study a variant of the two-dimensional Shastry-Sutherland (SS) spin- model with two types of dimers. Combined with the frustration of the SS model, this modification induces, in a large parameter range, a dimensional reduction at low energies, with nearly decoupled effective Haldane chains forming along one of the diagonals of the lattice. We also present evidence that the intermediate plaquette solid phase of the undistorted SS model remains stable in a finite region of the phase diagram.
- Received 23 December 2010
DOI:https://doi.org/10.1103/PhysRevB.83.140414
©2011 American Physical Society