Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Frustrated Magnets - Spin Liquids - Theory
TT 19.3: Vortrag
Montag, 12. März 2018, 15:30–15:45, H 3010
Global phase diagram for the extended Kitaev – Heisenberg model via cluster mean field theory — •Dorota Gotfryd1,2, Juraj Rusnacko3,4, and Jiri Chaloupka3,4 — 1Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Pasteura 5, PL-02093 Warsaw, Poland — 2Marian Smoluchowski Institute of Physics, Jagellonian University, Lojasiewicza 11, PL-30348 Krakow, Poland — 3Central European Institute of Technology, Masaryk University, Kamenice 753/5, 62500 Brno, Czech Republic — 4Department of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlarska 2, CZ-61137 Brno, Czech Republic
We present the global phase diagram for the extended Kitaev – Heisenberg model [1-4] obtained via cluster mean field theory (CMFT) [5]. We use (a) linearized and (b) full self – consistent CMFT to determine most of the magnetically ordered (Neel, FM, zigzag, stripy, vortex) and disordered (spin liquid) regions in the phase diagram. As the final outcome CMFT gives us the magnetic ordered moment direction and value for each phase. We conclude with the comparison of the characteristics of the ordered moment for CMFT, other methods and the experimental findings. [1] J.G. Rau et al., Phys. Rev. Lett.112, 077204 (2014). [2] J.G. Rau et al., arXiv: 1408.4811, (2014). [3] J. Chaloupka et al., Phys. Rev. B, 92, 024413 (2015). [4] J. Chaloupka et al., Phys. Rev. B, 94, 064435 (2016). [5] D. Gotfryd et al., Phys. Rev. B, 95, 024426 (2017).