Volume 114, Number 5, June 2016
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||08 July 2016|
Pseudospin transport in the Jeff = 1/2 antiferromagnet Sr2IrO4
1 Leibniz-Institute for Solid State and Materials Research, IFW-Dresden - 01069 Dresden, Germany
2 Department of Physics and Department of Advanced Materials, University of Tokyo - Hongo 113-0033, Japan
3 Max-Planck-Institute for Solid State Research - 70569 Stuttgart, Germany
4 Center for Transport and Devices, TU Dresden - 01069 Dresden, Germany
Received: 8 April 2016
Accepted: 17 June 2016
Spin transport by itinerant electrons and collective excitations of localized spins with small relaxation rates is of eminent interest for both fundamental research and applications. Spin-orbit coupling (SOC) is not only considered a crucial origin for spin relaxation in spin transport, it recently emerged as the source of novel quantum phases such as topological insulators or SOC-induced Mott insulators with Jeff = 1/2 pseudospins. Here we show that emergent pseudospin excitations in Sr2IrO4 give rise to significant heat transport despite this compound being a strong SOC-induced Mott insulator. The analysis of the heat conductivity reveals boundary-limited relaxation of the pseudospin excitations at low temperature. However, the relaxation rate dramatically increases upon heating towards room temperature due to thermally activated scattering off phonons. The comparison of this result with findings for cuprate analogs with S = 1/2 spin excitations suggests a radically stronger coupling of the Jeff = 1/2 pseudospin excitations to the lattice.
PACS: 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect / 44.10.+i – Heat conduction / 66.70.-f – Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves
© EPLA, 2016
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