Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Frustrated Magnets - Spin Liquids - Experiments
TT 41.7: Vortrag
Dienstag, 13. März 2018, 12:00–12:15, H 3005
NMR investigations on doped kagomé lattice mott insulator GaxCu4−x(OD)6Cl2 — •Ranjith Kumar Kizhake Malayil1, Pascal Puphal2, Cornelius Krellner2, and Michael Baenitz1 — 1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — 2Institute of Physics, Goethe- University Frankfurt, 60438 Frankfurt am Main, Germany
Herbertsmithite (ZnCu3(OH)6Cl2),[1] which is reported as a prototype kagome quantum spin liquid (QSL) triggers the search for new QSL materials among its polymorphs. Replacing the divalent Zn by the trivalent Ga was proposed to form a new correlated Dirac-kagome metal combining Dirac electrons, strong interactions, and frustrated magnetism[2]. Polycrystalline samples of GaxCu4−x(OD)6Cl2 were synthesized with Ga-doping level of 0 < x < 1. We have employed 71,69Ga and 2H nuclear magnetic resonance (NMR) experiments together with bulk studies to explore the ground state properties of GaxCu4−x(OD)6Cl2. Ga-NMR proof a homogeneous Ga distribution and narrow Ga-lines which is typical for Ga-based quantum magnets. Magnetic ordering is found to be suppressed with increasing Ga-concentration similar to that observed for Zn- Herbertsmithite. Spin-lattice relaxation measurement reveals the existence of a spin gap in the excitation spectrum which is increasing linearly with the applied field.
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