Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 40: Correlated Electrons: Low-dimensional Systems - Materials 3
TT 40.9: Talk
Thursday, March 29, 2012, 17:15–17:30, H 0104
Microscopic mechanism for the 1/8 magnetization plateau in SrCu2(BO3)2 — •Mike Nemec, Gregor Raphael Foltin, and Kai Phillip Schmidt — Lehrstuhl für Theoretische Physik I, Tu Dortmund, Germany
The frustrated quantum magnet SrCu2(BO3)2 shows a remarkably rich phase diagram in an external magnetic field which is not fully understood theoretically so far. The experimental results show a sequence of magnetization plateaux where the most prominent magnetization plateau is the one at 1/8. Theoretically, one expects that this frustrated quantum magnet should be well described by the Shastry-Sutherland model but recent calculations did not find the same sequence of magnetization plateaux as in experiments. In particular, no 1/8 plateau is found in theory. Here we study the effects of additional magnetic coupling terms like a finite Dzyaloshinskii-Moriya interaction. Most interestingly, the quantum fluctuations induced by such additional magnetic couplings lead very naturally to a stabilization of the 1/8 plateau for realistic values of the magnetic exchange constants.