Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.15: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Na1−xCoO2 bulk preparation by sol-gel and solid state routes — •Sandra Heinz1, Ingo Fritsch2, Claudia Fasel1, Philipp Komissinskiy1, Jose Kurian1, Hanns-Ulrich Habermeier2, and Lambert Alff1 — 1Department of Materials Science, TU Darmstadt, Germany — 2Max-Planck-Institute for Solid State Research, Stuttgart, Germany
For the investigation of unconventional superconductivity thin films are advantageous for Josephson junctions and tunneling devices. In case of the possible p-wave superconductor water intercalated sodium cobaltate, high quality thin films showing superconductivity have been obtained [1,2]. The first step of thin film preparation by pulsed laser deposition is a reproducible, phase pure bulk target. Here we report on sodium cobaltate target fabrication by a sol-gel and by a solid state route. Two preparation routes are described to receive high quality, stable targets without parasitic phases. The targets were characterized by X-ray diffraction, high resolution scanning electron microscopy, energy dispersive X-ray analysis, thermal gravimetric analysis and magnetometry. Na1−xCoO2 targets can be obtained for x between 0.3 and 0. Textured targets can be realized with grain sizes down to the nanometer range by the sol-gel method.
[1] Y. Krockenberger, I. Fritsch, G. Cristiani, A. Matveev, L. Alff, H.-U. Habermeier, and B. Keimer, Appl. Phys. Lett. 86, 191913 (2005).
[2] Y. Krockenberger, I. Fritsch, G. Cristiani, H.-U. Habermeier, Li Yu, C. Bernhard, B. Keimer, and L. Alff, Appl. Phys. Lett. 88, 162501 (2006).