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Ground-State Phase Diagram for the Three-Dimensional Orthogonal-Dimer System

Akihisa Koga

cond-mat.str-elarXiv:cond-mat/0009266

Abstract

We investigate quantum phase transitions in the three-dimensional orthogonal-dimer system of the compound SrCu2(BO3)2 by means of the series expansion technique. We then discuss the phase diagram where the dimer phase, the Haldane phase, the frustration-induced disordered phase and the magnetically ordered phase compete with each other. It is found that the compound SrCu2(BO3)2 is located in the dimer phase close to the phase boundary.

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