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MA: Fachverband Magnetismus

MA 53: Focus Session: Topology meets Magnetism

MA 53.2: Hauptvortrag

Donnerstag, 23. März 2017, 15:30–16:00, HSZ 01

Thermal Hall Effect of Spin Excitations in Quantum Magnets — •Max Hirschberger¹, Robin Chisnell², Jason W. Krizan³, Young S. Lee², Robert J. Cava³, and N. Phuan Ong¹ — ¹Department of Physics, Princeton University, USA — ²Department of Physics, Massachusetts Institute of Technology, USA — ³Department of Chemistry, Princeton University, USA

In magnetic materials without delocalized electrons, the thermal Hall effect κ_xy is a sensitive tool to explore the topological properties of low-energy magnetic (spin) excitations in a magnetic field. For magnetically ordered systems, κ_xy is a direct probe of the Berry curvature of the quasiparticle bands. We will illustrate this point using our experimental results for the 2D layered Kagome ferromagnet Cu(1,3bdc). Moreover, we will discuss our measurements of a large κ_xy on the frustrated pyrochlore quantum spin ice Tb₂Ti₂O₇, and its close relative Yb₂Ti₂O₇. Finally, we highlight the absence (to our resolution) of a thermal Hall signal in many other frustrated magnetic systems we have studied recently.