Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 1: Focus Session: Frustration in Mott Insulators and Mott Criticality

TT 1.6: Hauptvortrag

Montag, 20. März 2017, 12:15–12:45, HSZ 03

Toward Understanding the Complex Magnetism in Kitaev Spin-Liquid Candidates — •Stephen Winter, Kira Riedl, and Roser Valenti — Institut fur Theoretische Physik, Goethe-Universitat Frankfurt

Intensive study of the magnetic response of 5d honeycomb Iridates A₂IrO₃ and 4d α-RuCl₃ has been motivated recently by signatures of strongly anisotropic and frustrated interactions reminiscent of the Kitaev spin-liquid. In these materials the complex magnetic interactions arise from a competition between various similar energy scales, including spin-orbit coupling (SOC), Hund’s coupling, and crystal-field splitting. Due to this complexity, the interactions in such systems remain hotly debated. In this contribution, we will review the state of the art - the picture that emerges from a combination of ab-initio calculations, microscopic considerations, and analysis of the static magnetic responses. We also discuss the excitation continua observed in a variety of experiments including Raman, neutron, and inelastic x-ray, and conclude that such signatures of fractionalization can persist even far away from the spin-liquid ground state.