Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.45: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Study of spontaneously induced chemical ordering in epitaxial thin films of the double perovskite La₂FeCrO₆ — •Supratik Dasgupta, Vikas Shabadi, Philipp Komissinskiy, and Lambert Alff — Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Strasse 2, 64287 Darmstadt

In double perovskites (A₂BB′O₆), antisite disorder plays a crucial role for their functional properties. A large difference in ionic radii and the formal valence states of the two B-site cations is known to favour a chemically ordered state. In the case of the ferrimagnetic insulator La₂FeCrO₆, Fe and Cr have nearly the same ionic radii and the same valence state, making chemical order difficult to achieve. Recently, for La₂FeCrO₆ nearly 90% ordering was reported in epitaxial thin films grown by pulsed laser deposition (PLD) with a saturation magnetization of 2 µ_B/f.u. corresponding to a Fe-O-Cr superexchange interaction [1]. We have systematically studied the influence of various PLD parameters on the growth of epitaxial thin films of La₂FeCrO₆ along with an extensive structural, chemical and magnetic characterization. Laser fluence and substrate temperature have been found to be the most critical parameters that determine chemical order.
S. Chakraverty et al., Phys. Rev. B 84, 064436 (2011).