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TT: Fachverband Tiefe Temperaturen

TT 17: Correlated Electrons: Spin Systems, Itinerant Magnets 2

TT 17.9: Vortrag

Montag, 11. März 2013, 17:30–17:45, H19

Quantum helimagnets: detriments and new chances for multipolar phasesSatoshi Nishimoto1, •Stefan-Ludwig Drechsler1, Roman Kuzian2, Johannes Richter3, and Jeroen van den Brink11Institut für Theoretische Festkörperphysik am IFW-Dresden, P.O. Box 270116, D-01171 Dresden, Germany — 2Institute for Materials Science, Kiiv, Ukraine — 3Universiät Magdeburg, Institut für Theoretische Physik, Germany

Arbitrarily strong coupled frustrated spin-1/2 chains in high magnetic fields described within the ferro- antiferromagnetic J1-J2 Heisenberg model and various types of interchain coupling are studied by DMRG, hard-core boson, and spin-wave theory approaches. Multipolar phases related to multimagnon bound states are destroyed (supported) by weak antiferromagnetic (ferromagnetic) interchain couplings Jic. We show that quantum spin nematics (quadrupolar phase) might be found for LiVCuO4 whereas for Li(Na)Cu2O2 it is prevented by a sizeable antiferromagnetic Jic. Instead PbCuSO4(OH)2 (linarite) with sizable easy-axis anisotropy for ferromagnetic nearest neighbor inchain coupling J1 of about 12% might be a good candidate for a triatic (octupolar) phase.

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DPG-Physik > DPG-Verhandlungen > 2013 > Regensburg