Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 30: Correlated Electrons: Spin Systems and Itinerant Magnets – Frustrated Magnets 3 (jointly with MA)

TT 30.9: Talk

Tuesday, March 17, 2015, 11:45–12:00, H 0110

Magnetic heat transport in Sr₂IrO₄ — •Frank Steckel¹, Hidenori Takagi², Bernd Buechner^1,3, and Christian Hess^1,3 — ¹Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01069 Dresden — ²Max-Planck-Institute for Solid State Research, 70569 Stuttgart — ³Center for Transport and Devices, TU Dresden, 01069 Dresden

The layered perovskite Sr₂IrO₄ is a 5d transition metal oxide with an enhanced spin-orbit coupling leading to a Mott insulating ground state with J_eff=1/2. It exhibits canted antiferromagnetism below T_N=240 K with an antiferromagnetic coupling constant of about J=0.1 eV. Thermal conductivity measurements along the ab plane of a Sr₂IrO₄ single crystal provide evidence for a contribution of magnons (below T_N) to the thermal conductivity, similar to that of the isostructural 2D S=1/2 Heisenberg antiferromagnet La₂CuO₄, where a significant magnonic contribution to the heat transport is known.