Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.50: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Giant Magnetostriction, structural domain switching, and anomalous Hall effect on untwinned SrRuO₃ single crystals — •Danie Brüning, Stefan Kunkemöller, Markus Braden, and Thomas Lorenz — II. Physikalisches Institut, Universität zu Köln, Deutschland

SrRuO₃ is the infinite-layer material of the well-known Ruddlesden-Popper series of ruthenates Sr_n+1Ru_nO_3n+1, which have attracted enormous interest not only due to the unconventional superconductivity in Sr₂RuO₄. Ruthenates show a large variety of physical phenomena due to electronic correlations and spin-orbit coupling. SrRuO₃ is the only ferromagnetic metal in this series. It is heavily studied as a conducting perovskite layer in thin films. Despite the big interest in the research of SrRuO₃ large and high quality single crystals became available only very recently. Our high quality cm³ size single crystals are grown with the optical floating zone technique. From the high temperature cubic phase SrRuO₃ becomes tetragonal and orthorhombic via two transitions which allows for 6 twins. With uniaxial pressure applied upon cooling it is possible to untwin these crystals. We present investigations on the switching of the different structural domain states linked to a giant magnetostriction. Additionally, we analyze the anomalous Hall effect of SrRuO₃ and the anisotropy gap in the magnon dispersion.

Supported by the DFG via CRC 1238.

[1] S. Kunkemöller et al., Crys. Res. and Technol., 51: 299 (2016)