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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 Baenitz11Max 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.
P. Mendels et al., J. Phys. Soc. Jpn. 79, 011001 (2010).
I. Mazin et al., Nature Communications 5, 4261 (2014)

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