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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 Buechner1,3, and Christian Hess1,31Leibniz 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 Jeff=1/2. It exhibits canted antiferromagnetism below TN=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 TN) 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.

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