Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 79: Oxide Surfaces III
O 79.9: Vortrag
Donnerstag, 14. März 2013, 18:00–18:15, H45
Is the BaTiO3 (001)-(2x1) reconstruction magnetic ? — •Holger. L. Meyerheim1, A. Ernst1, K. Mohseni1, I.V. Maznichenko2, S. Ostanin1, F. Klimenta1, N. Jedrecy3, W. Feng1, I. Mertig2, R. Felici4, and J. Kirschner1 — 1Max-Planck-Institut f. Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany — 2Institut f. Physik, Martin-Luther-Univ. Halle-Wittenberg, D-06099 Halle, Germany — 3Institut des Nano Sciences de Paris, UPMC-Sorbonne Univ., CNRS-UMR7588, 75005 Paris, France — 4ESRF, B. P. 220, F-38043 Grenoble Cedex, France
Though BaTiO3 is the prototype perovskite type ferroelectric and its (2x1) reconstruction has been observed more than 30 years ago [1] no detailed analysis of its atomic geometry has been reported so far. We have carried out a surface x-ray diffraction analysis of the BTO(001)-(2×1) reconstructed surface [2]. While the crystal is terminated by two TiO2 layers similarly to SrTiO3(001)-(2×1) [3], we find that one Ti-atom of the top TiO2 layer resides in a tetragonal pyramidal oxygen environment. Ab initio calculations based on this structure model suggest that the surface is metallic and magnetic involving local magnetic moments up to 2µB in magnitude located at surface Ti and O atoms.
References: [1] R. Courths, Phys. Status Solidi B 100, 135 (1980) [2] H. L. Meyerheim, A. Ernst, K. Mohseni, I. V. Maznichenko, S. Ostanin, F. Klimenta, N. Jedrecy, W. Feng, I. Mertig, R. Felici,, and J. Kirchner, Phys. Rev. Lett. 108, 215502 (2012) [3] N. Erdman, K.R. Poeppelmeier, M. Asta et al., Nature 419, 55 (2002)