Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 20: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets II
TT 20.4: Vortrag
Montag, 31. März 2014, 15:45–16:00, HSZ 304
The 2D Shastry-Sutherland model and SrCu2(BO3)2 in Magnetic Fields up to 118T — •Andreas Honecker1, Philippe Corboz2, Frédéric Mila3, HongYu Yang3, Salvatore R. Manmana1, Kai P. Schmidt4, Gregor R. Foltin4, Hiroshi Kageyama5, Nozomu Abe6, Shojiro Takeyama6, and Yasuhiro Matsuda6 — 1Georg-August-Universität Göttingen, Germany — 2ETH Zürich, Switzerland — 3Ecole Polytechnique Fédérale de Lausanne, Switzerland — 4TU Dortmund, Germany — 5Kyoto University, Japan — 6ISSP, University of Tokyo, Japan
The magnetization process of the orthogonal-dimer antiferromagnet SrCu2(BO3)2 is investigated in high magnetic fields of up to 118T. A 1/2 plateau is clearly observed in the field range 84 to 108T in addition to 1/3, 1/4, and 1/8 plateaux at lower fields. Using a combination of state-of-the-art numerical simulations, the main features of the high-field magnetization curve are shown to agree quantitatively with the Shastry-Sutherland model for a ratio of inter- to intra-dimer exchange interactions J′/ J =0.63. It is further predicted that the intermediate phase between the 1/3 and 1/2 plateau consists of a 1/3 supersolid followed by a non-plateau 2/5 supersolid. As a byproduct, we obtain estimates for the boundaries of a zero-field plaquette phase based on exact diagonalization with up to N=40 sites.