Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 13: Symposium “Superconductivity and Magnetism in Lamellar Cobaltates”
TT 13.7: Talk
Tuesday, March 27, 2007, 17:10–17:35, H18
Superconducting epitaxial thin films of NaxCoO2· yD2O: A route to new experiments — Yoshiharu Krockenberger1,2, Ingo Fritsch2, Philipp Komissinskiy1, Georg Christiani2, Hanns-Ulrich Habermeier2, and •Lambert Alff1 — 1Institute for Materials Science, TU Darmstadt — 2Max-Planck-Institute for Solid State Research, Stuttgart
We report on the fabrication of epitaxial thin films of sodium cobaltate [1] and describe a way how to intercalate water in these films in order to obtain superconductivity [2]. The epitaxial thin films are grown using pulsed laser deposition. We suggest a growth model for the hexagonal layered sodium cobaltate on the square lattice of the SrTiO3 substrates. While these results are in themselves an achievement of advanced thin film technology, the availability of epitaxial thin films opens the way for improved and new experiments with NaxCoO2· yD2O. While improved surface quality enhances the possibility of surface sensitive measurements, thin films also allow for the fabrication of Josphson and tunnel junctions to study the superconducting order parameter.
These work is supported by the Deutsche Forschungsgemeinschaft (project Al560/6).
[1] Y. Krockenberger, I. Fritsch, G. Christiani, A. Matveev, L. Alff, H.-U. Habermeier, and B. Keimer, Appl. Phys. Lett. 86, 191913 (2005).
[2] Y. Krockenberger, I. Fritsch, G. Christiani, H.-U. Habermeier, Li Yu, C. Bernhard, B. Keimer, and L. Alff, Appl. Phys. Lett. 88, 162501 (2006).