Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnetic Materials II
MA 8.8: Vortrag
Montag, 26. März 2007, 17:00–17:15, H22
Sr2CrOsO6: Spin polarized metal-insulator transition by 5d band filling — Yoshiharu Krockenberger1,2, Kaylash Mogare2, Manfred Reehuis2,3, Martin Tovar3, Martin Jansen2, Ganapathy Vaitheeswaran4, Venkata Kanchana4, Anna Delin4, Fabrice Wilhelm5, Andrei Rogalev5, Andreas Winkler1, and •Lambert Alff1 — 1Institut für Materialwissenschaft, TU Darmstadt — 2Max-Planck-Institut für Festkörperforschung, Stuttgart — 3Hahn-Meitner-Institut, Berlin — 4Department of Materials Science and Engineering, KTH Stockholm — 5European Synchrotron Radiation Facility (ESRF), Grenoble
In the search for new spintronic materials with high spin-polarization at room-temperature, we have synthesized an osmium based double perovskite with a Curie-temperature of 725 K. Our combined experimental results confirm the existence of a sizable induced magnetic moment at the Os site, supported by band-structure calculations in agreement with a proposed kinetic energy driven mechanism of ferrimagnetism in these compounds. The intriguing property of Sr2CrOsO6 is that it is at the endpoint of a metal-insulator transition due to 5d band filling, and at the same time ferrimagnetism and high-spin polarization is preserved.
[1] Y. Krockenberger, K. Mogare, M. Reehuis, M. Tovar, M. Jansen, G. Vaitheeswaran, V. Kanchana, F. Bultmark, A. Delin, F. Wilhelm, A. Rogalev, A. Winkler, and L. Alff. Phys. Rev. B, Rapid Comm. (2007).