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Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1

MA 21.2: Talk

Tuesday, March 21, 2017, 09:45–10:00, HSZ 304

Spin liquid behavior in the triangular lattice iridate Ba3InIr2O9 — •Tusharkanti Dey1, Mayukh Majumder1, Anatoliy Senyshyn2, Panchanan Khuntia3, Alexander Tsirlin1, and Philipp Gegenwart11EP-VI, EKM, University of Augsburg, Germany — 2Munich University of Technology, Germany — 3Universite Paris-Sud, Orsay, France

Materials with the general formula Ba3MIr2O9 (M is a trivalent ion) crystallize in a hexagonal structure containing face-sharing Ir2O9 bi-octahedra forming Ir-Ir dimers along the crystallographic c-axis. These dimers build a triangular lattice in the crystallographic ab-plane. In these materials, Ir has a single crystallographic site with an average charge state +4.5. Therefore the two Ir sites within the dimer share one electron among them. This fractional charge state combined with the frustrated geometry give rise to many interesting properties like magnetoelastic effect, spin gap behavior and magnetic ordering. We have recently synthesized polycrystalline sample of Ba3In3+Ir4.5+2O9 and studied its structural, magnetic and thermodynamic properties in detail. Our magnetic susceptibility data show the absence of magnetic ordering down to 0.4 K which is very small compared to the Weiss temperature. The magnetic heat capacity shows a hump at 1.6 K and follows power law with temperature below 1 K. In this presentation, we will discuss these results suggesting a quantum spin liquid ground state for this material.

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