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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Frustrated Magnets - General 1 (joint session TT/MA)

TT 23.6: Vortrag

Dienstag, 2. April 2019, 10:45–11:00, Theater

Theory of the intermediate phase of SrCu2(BO3)2 under pressure — •Carolin Boos1,2, Schelto Crone3, Ido Niesen3, Philippe Corboz3, Frédéric Mila2, and Kai Phillip Schmidt11FAU Erlangen-Nürnberg, Germany — 2EPF Lausanne, Switzerland — 3University of Amsterdam, Netherlands

Building on the NMR evidence that two different Cu sites are present in the intermediate phase of SrCu2(BO3)2 under pressure, we investigate the nature of the intermediate phase in an orthorhombically distorted Shastry-Sutherland model. We show that a few percent difference between nearest-neighbor couplings is sufficient to destabilize the plaquette phase in favor of a one-dimensional phase in which bonds around half the full plaquettes become stronger. This phase is adiabatically connected to the Haldane phase that is stabilized when next-nearest neighbor couplings take different values, and the excitations in this one-dimensional phase are shown to agree qualitatively with neutron scattering results.

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