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TT: Fachverband Tiefe Temperaturen

TT 49: CE: Spin Systems and Itinerant Magnets 2

TT 49.17: Vortrag

Donnerstag, 17. März 2011, 18:30–18:45, HSZ 03

The effect of interchain coupling on multipolar phases in quasi-1d quantum helimagnets — •S. Nishimoto¹, S.-L Drechsler¹, R.O. Kuzian¹, J. Richter², and J. van den Brink¹ — ¹IFW Dresden, Germany — ²Universität Magdeburg, Germany

Coupled frustrated spin-1/2 chains in high magnetic fields described within the ferro- antiferromagnetic J₁-J₂ Heisenberg model are studied by DMRG, hard core boson, and spin wave theory approaches. Multipolar phases related to magnon bound states are destroyed (supported) by weak antiferromagnetic (ferromagnetic) interchain couplings J_ic. We show that quantum spin nematics might be found for LiVCuO₄ whereas for Li(Na)Cu₂O₂ it is prevented by a sizeable antiferromagnetic J_ic. Also for Li₂ZrCuO₄ with a small antiferromagnetic J_ic expected triatic or quartic phases are unlikely, too. The saturation field is found to be strongly affected even by a relatively small J_ic.
S. Nishimoto, S.-L. Drechsler, R.O. Kuzian, J. Richter, and J. van den Brink, arXiv:1005.5500v2.
S. Nishimoto, S.-L. Drechsler, R.O. Kuzian, J. van den Brink, J. Richter, W.E.A. Lorenz, Y. Skourski, R. Klingeler, B. Büchner, arXiv:1004.3300v2.
S.-L. Drechsler, S. Nishimoto, R.O. Kuzian, J. Malek, W.E.A. Lorenz, J. Richter, J. van den Brink, M. Schmitt, H. Rosner, arXiv:1006.5070v2.