Regensburg 2013 – wissenschaftliches Programm

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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 phases — Satoshi Nishimoto¹, •Stefan-Ludwig Drechsler¹, Roman Kuzian², Johannes Richter³, and Jeroen van den Brink¹ — ¹Institut 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 J_ic. 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 J_ic. 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.