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 Boos^1,2, Schelto Crone³, Ido Niesen³, Philippe Corboz³, Frédéric Mila², and Kai Phillip Schmidt¹ — ¹FAU 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.