Exact Demonstration of Magnetization Plateaus and First-Order Dimer-Néel Phase Transitions in a Modified Shastry-Sutherland Model for SrCu2(BO3)2

Erwin Müller-Hartmann, Rajiv R. P. Singh, Christian Knetter, and Götz S. Uhrig
Phys. Rev. Lett. 84, 1808 – Published 21 February 2000
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Abstract

We study a generalized Shastry-Sutherland model for the material SrCu2(BO3)2. Along a line in the parameter space, we show rigorously that the model has a first-order phase transition between dimerized and Néel-ordered ground states. Furthermore, when a magnetic field is applied in the dimerized phase, magnetization plateaus develop at commensurate values of the magnetization. We also discuss various aspects of the phase diagram and properties of this model away from this exactly soluble line, which include gap-closing continuous transitions between dimerized and magnetically ordered phases.

  • Received 7 October 1999

DOI:https://doi.org/10.1103/PhysRevLett.84.1808

©2000 American Physical Society

Authors & Affiliations

Erwin Müller-Hartmann* and Rajiv R. P. Singh

  • Institute for Theoretical Physics, University of California, Santa Barbara, California 93106

Christian Knetter and Götz S. Uhrig

  • Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany

  • *Permanent address: Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.
  • Permanent address: Department of Physics, University of California, Davis, CA 95616.

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Vol. 84, Iss. 8 — 21 February 2000

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