The structure of the (001) surface of Sr$_{3}$(Ru$_{1-x}$Mn$_{x })_{2}$O$_{7}$

ORAL

Abstract

It has become quite clear that small structural distortions at the surface of complex materials like the transition-metal-oxides can have profound effects on the physical properties at the surface. We have investigated the surface structure of Sr$_{3}$(Ru$_{1-x}$Mn$_{x })_{2}$O$_{7 }$as a function of Mn substitution for Ru. Analysis of Sr$_{3}$Ru$_{2}$O$_{7}$ indicates an unexpected tilt (4\r{ }) as well as a larger rotation for the top RuO$_{6}$ octahedron (12\r{ }). Preliminary results indicate the tilted structural phase seems to be progressively suppressed by the substitution of Ru for Mn in the doped system. Electron diffraction patterns for a Mn doping level of only 10{\%}, already indicate a very small tilt angle at the surface ($\sim $1\r{ }). The question is what effect this structural change will have on the magnetic ordering in the bilayered manganite. Extensive studies on the single-layered (Sr,Ca)2RuO$_{4}$ system reveal that rotation and tilt of RuO$_{6}$ octahedra plays a critical role in their physical properties, both in bulk and at the surface.

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Authors

  • Von Braun Nascimento

    Department of Physics \& Astronomy, Louisiana State University, Baton Rouge, LA, 70803, Dept of Physics and Astronomy, Louisiana State University

  • Biao Hu

    Department of physics and Astronomy, Louisiana State University, Dept of Physics and Astronomy, Louisiana State University

  • Rongying Jin

    Department of physics and Astronomy, Louisiana State University, Department of Physics \& Astronomy, Louisiana State University, Baton Rouge, LA, 70803, Department of Physics and Astronomy, Louisiana State University, Louisiana State University, Dept of Physics and Astronomy, Louisiana State University

  • E. Ward Plummer

    Department of physics and Astronomy, Louisiana State University, Louisiana State University, Department of Physics \& Astronomy, Louisiana State University, Baton Rouge, LA, 70803, Louisiana State University, Baton Rouge, LA 70808, Dept of Physics and Astronomy, Louisiana State University