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TT: Fachverband Tiefe Temperaturen

TT 25: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1

TT 25.2: Vortrag

Dienstag, 21. März 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 Gegenwart¹ — ¹EP-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⁺Ir^4.5+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.