Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Correlated Electrons: Frustrated Magnets - Low-Dimensional Systems
TT 50.8: Vortrag
Mittwoch, 22. März 2017, 17:00–17:15, HSZ 304
Unconventional nematic state in the frustrated and anisotropic spin-chain cuprate LiCuSbO4 — •Satoshi Nishimoto1,2, Hans-Joachim Grafe1, Margarita Iakovleva1,3, Evgeniia Vavilova1,3, Alexey Alfonsov1, Mihai-I. Sturza1, Helge Rosner4, Johannes Richter5, Ulrich Rössler1, Stefan-Ludwig Drechsler1, Vladislav Kataev1, and Bernd Büuchner1,2 — 1IFW Dresden, Germany — 2TU Dresden, Germany — 3Zavoisky Physical Technical Institute, Kazan, Russia — 4MPI-cPfS, Dresden, Germany — 5U. Magdeburg, Germany
Modern theories of quantum magnetism predict exotic multipolar states in frustrated spin-1/2 Heisenberg chains with ferromagnetic nearest-neighbor (NN) inchain exchange in high magnetic fields. Experimentally these states remained elusive so far. Here we report the evidence for a long-sought magnetic field-induced nematic state arising above a field of ∼ 13 T in the edge-sharing chain cuprate LiCuSbO4. This interpretation is based on the observation of a field induced spin-gap in the measurements of the 7Li NMR spin relaxation rate T1−1 as well as a contrasting field-dependent power-law behavior of T1−1 vs. T and is further supported by static magnetization and ESR data. An underlying theoretical microscopic approach favoring a unconventional nematic scenario is based essentially on the NN XYZ exchange anisotropy within a model for frustrated spin-1/2 chains. It is investigated by the DMRG technique. The employed exchange parameters are justified qualitatively by electronic structure calculations for LiCuSbO4.