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Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 109: Frustrated Magnets - (General) Theory

TT 109.9: Talk

Friday, March 16, 2018, 11:45–12:00, H 3005

Plaquette phases in an extended Shastry-Sutherland model — •Carolin Boos1, Philippe Corboz2, Schelto Crone2, Frédéric Mila3, Ido Niesen2, and Kai Phillip Schmidt11FAU Erlangen-Nürnberg, Germany — 2University of Amsterdam, Netherlands — 3EPF Lausanne, Switzerland

The frustrated magnet SrCu2(BO3)2 exhibits a quantum phase transition under high pressure. Without pressure this material is well described by the two-dimensional Shastry-Sutherland model with parameters close to a phase transition towards a ground state of singlets on empty plaquettes. This state is therefore the natural candidate for the high-pressure phase. However, it has also been suggested [1] that a different plaquette phase, where singlets reside on the full plaquettes containing a diagonal bond, is realized in SrCu2(BO3)2. In this work we use high-order series expansions and infinite projected entangled pair states (iPEPS) to investigate the interplay between empty and full plaquette phases in an extended Shastry-Sutherland model.
M. E. Zayed et al., Nat. Phys. 13 (2017) 962

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