Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.49: Poster

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

Crystal growth of Ti-doped perovskite ruthenates — •Kevin Jenni, Sebastian Hoffmann, Stefan Kunkemöller, and Markus Braden — II. Physikalisches Institut, Universität zu Köln

Ruthenates of the Ruddlesden-Popper series exhibit a variety of interesting phenomena ranging from unconventional superconductivity in Sr₂RuO₄ to the Mott-insulating state in Ca₂RuO₄. Titanium doping has been found to alter dramatically the physical properties of these materials. By partially replacing the Ruthenium in the Oxygen octahedra by nonmagnetic four-valent Titanium magnetic fluctuations can be stabilized which leads to a SDW ordering in Sr₂Ru_0.91Ti_0.09O₄ or Sr₃(Ru_0.91Ti_0.09)₂O₇. In Ca_1.78Sr_0.22Ru_0.9Ti_0.1O₄ a metal-insulator phase transition can be observed around 80 K in contrast to the undoped sample which is metamagnetic. However the availability of ruthenate crystals is limited because the growth is challenging due to the high evaporation of ruthenium up to 90% and the intergrowth of different layered ruthenates. Therefore the determination of exact growth parameters is crucial. We present the growth of single crystals of Ca_1.78Sr_0.22Ru_1−xTi_xO₄ and Ca_2−xSr_xRuO₄. The crystal growth was conducted by travelling floating-zone method using a Canon SC1-MDH mirror furnace yielding large crystals.