Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.28: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Extrinsic Spin Nernst effect and thermoelectric transport coefficients — •Franziska Töpler1, Christian Herschbach1, Dmitry Fedorov2, Martin Gradhand3, and Ingrid Mertig1,4 — 1Martin Luther University Halle-Wittenberg, Halle, Germany — 2University of Luxembourg, L-1511 Luxembourg, Luxembourg — 3University of Bristol, Bristol, United Kingdom — 4Max Planck Institute of Microstructure Physics, Halle, Germany
The field of spin caloritronics investigates the combined transport of spin, charge and heat. The corresponding currents are coupled to thermal and electric gradients via linear transport coefficients [1,2]. We calculate the extrinsic contribution to these coefficients caused by skew-scattering. For this purpose we use a fully relativistic KKR-Green’s function method and solve the semiclassical Boltzmann equation [3,4]. We present temperature-dependent results for thermopower, spin Nernst angle and efficiency for Cu-based dilute alloys [5]. In case of Au defects we introduce an improved integration method to reduce computational effort and enhance accuracy. We compare results of both procedures for various thermoelectric quantities.
[1] Boona et al., Energy Environ. Sci. 7, 885 (2014); [2] Bauer et al., Nat. Mater. 11, 391 (2012); [3] Gradhand et al., PRB 80, 224413 (2009); [4] Gradhand et al., Phys. Rev. Lett. 104, 186403 (2010); [5] Tauber et al., Phys. Rev. Lett. 109, 026601 (2012).