Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: POSTER II

MA 49.24: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster A

Magnetic and Charge Ordering in La_1/3Sr_2/3FeO₃ powder samples, single crystals, and thin films — •Markus Waschk, Alexander Weber, Jörg Persson, and Thomas Brückel — Jülich Center for Neutron Science JCNS and Peter Grünberg Institut PGI: Streumethoden, Forschungszentrum Jülich GmbH, 52428 Jülich

In recent years the multifunctional oxides are considered promising candidates for future, highly efficient storage devices in information technology. Transition metal oxides with mixed valances, exhibit fascinating magnetic and electronic properties, governed closely to the system of correlated electrons. A very interesting material is the distorted perovskite La_1/3Sr_2/3FeO₃ (LSFO). This complex compound, as well as showing charge disproportionation through mixed valency, also exhibits magnetic and charge ordering. The complex interplay between these effects is extremely interesting, where the magnetic ordering in terms of antiferromagnetic order and the charge order occur at circa 200 K. A Verwey “like” transition is also seen as a significant jump in resistivity measurements. In order to understand LSFO in detail, the consideration of different self-made sample types (powder, single crystal and thin films) is necessary. This will lead to a further understanding of the underlying mechanism of the complex ordering. Characterization of these highly stoichiometric single phase samples with X-rays, magnetization and polarized neutron measurements provides a greater insight into the intrinsic magnetism and crystal structure and their influence on each other.