Magnetic Nanopantograph in the SrCu₂(BO₃)₂ Shastry-Sutherland Lattice

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Magnetic Nanopantograph in the SrCu₂(BO₃)₂ Shastry-Sutherland Lattice

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Title: Magnetic Nanopantograph in the SrCu₂(BO₃)₂ Shastry-Sutherland Lattice
Author(s):
Radtke, Guillaume;
Saúl, Andrés;
Dabkowska, Hanna A.;
Salamon, Myron B. (UT Dallas);
Jaime, Marcelo
Item Type: Article
Keywords: Show Keywords
Description: Includes supporting information
Abstract: Magnetic materials having competing, i.e., frustrated, interactions can display magnetism prolific in intricate structures, discrete jumps, plateaus, and exotic spin states with increasing applied magnetic fields. When the associated elastic energy cost is not too expensive, this high potential can be enhanced by the existence of an omnipresent magnetoelastic coupling. Here we report experimental and theoretical evidence of a nonnegligible magnetoelastic coupling in one of these fascinating materials, SrCu₂(BO₃)₂ (SCBO). First, using pulsed-field transversal and longitudinal magnetostriction measurements we show that its physical dimensions, indeed, mimic closely its unusually rich field-induced magnetism. Second, using density functional-based calculations we find that the driving force behind the magnetoelastic coupling is the CuOCu superexchange angle that, due to the orthogonal Cu²⁺ dimers acting as pantographs, can shrink significantly (0.44%) with minute (0.01%) variations in the lattice parameters. With this original approach we also find a reduction of ~10% in the intradimer exchange integral J, enough to make predictions for the highly magnetized states and the effects of applied pressure on SCBO.
Publisher: National Academy of Sciences
ISSN: 1091-6490
Persistent Link: http://hdl.handle.net/10735.1/4388
http://dx.doi.org/10.1073/pnas.1421414112
Terms of Use: ©2015 PNAS
Sponsors: "M.J. acknowledges useful discussions with Prof. B. D. Gaulin, McMaster University and Cristian D. Batista, Los Alamos National Laboratory (LANL). The National High Magnetic Field Laboratory Pulsed-Field Facility is supported by the National Science Foundation (NSF), the US Department of Energy (DOE), and the State of Florida through NSF Cooperative Grant DMR-1157490. Work at LANL was supported by the US DOE Basic Energy Science project “Science at 100 Tesla.” This work was granted access to the High Performance Computing resources of Institut du Développement et des Ressources en Informatique Scientique under the allocations 2014-100384 made by Grand Equipement National de Calcul Intensif."

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