Berlin 2005 – scientific programme
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TT: Tiefe Temperaturen
TT 10: Superconductivity - Tunneling, Josephson Junctions, SQUIDs
TT 10.13: Talk
Saturday, March 5, 2005, 11:45–12:00, TU H104
Intrinsic tunneling in perovskite derivatives: From superconductivity to ferroelectricity — •Y. Koval1, F. Chowdhury1, P. Müller1, F. Lichtenberg2, and J. Manhart2 — 1Physikalisches Institut III der Universität Erlangen-Nürnberg, Erwin-Rommel Str. 1, 91058 Erlangen, Germany — 2Experimentalphysik VI der Universität Augsburg, D-86135 Augsburg, Germany
There is a variety of extensions of the basic perovskite crystalline structure. Intercalating the perovskite octahedra with additional layers can result in superconductivity in the high-Tc materials, or in ferromagnetism in some Ruddlesden-Popper phases. In many cases the crystalline sheets of the layered structure alternate between conducting and insulating regions. As a consequence, electrical transport perpendicular to the layers is provided by tunneling. This can range from intrinsic Josephson effects in the high-Tc superconductors to interesting permanent memory effects in titanate based layered perovskites. We present a summary of our recent results.