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TT: Fachverband Tiefe Temperaturen

TT 25: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1

TT 25.12: Vortrag

Dienstag, 21. März 2017, 12:30–12:45, HSZ 304

Strain induced changes of electronic properties of B–site ordered Sr₂CoIrO₆ thin films — •Sebastian Esser¹, Chun-Fu Chang², Vladimir Roddatis³, Vasily Moshnyaga⁴, Liu Hao Tjeng², and Philipp Gegenwart¹ — ¹Experimentalphysik VI, Universität Augsburg, 86159 Augsburg, Germany — ²Max Planck Institut für Chemische Physik fester Stoffe, 01187 Dresden, Germany — ³Institut für Materialphysik, Georg-August-Universität Göttingen, 37077 Göttingen, Germany — ⁴1. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany

Tight-binding calculations for perovskite SrIrO₃ indicate a line node near the Fermi energy. Introducing a staggered potential between the iridate layers should gap out the nodal line, leaving a pair of three-dimensional nodal points [1] and providing a strong motivation to synthesize B–site ordered double perovskite iridate materials.

By using a metal-organic aerosol deposition technique we have grown Sr₂CoIrO₆ thin films on various (pseudo) cubic (001)-oriented substrates to investigate the strain induced changes of the electronic properties. The fully epitaxial strained state of the thin films was verified by x-ray diffraction patterns in combination with reciprocal space mapping and TEM images. HAXPES measurements at SPring-8 indicating a strain induced change of the valence band in the near of the Fermi edge. These changes are also affecting the electrical transport properties, which were investigated down to lowest temperatures.

This work is supported by the German Science foundation through SPP 1666.

[1] J.-M. Carter et al., Phys. Rev. B 85 (2012) 115105.