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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 9: SC: Poster Session

TT 9.17: Poster

Monday, March 22, 2010, 14:00–18:00, Poster A

Superconductivity in Na1−xCoO2·yH2O thin films — •Sandra Hildebrandt1, Philipp Komissinkiy1, Ingo Fritsch2, Hanns-Ulrich Habermeier2, Peter Lemmens3, and Lambert Alff11Institute for Materials Science, TU Darmstadt — 2Max Planck Institute for Solid State Research, Stuttgart — 3Institute for Condensed Matter Physics, TU Braunschweig

Sodium cobaltate (Na1−xCoO2) is a novel material with thermoelectric behavior, charge and spin ordered states dependent on the sodium content in the composition. A superconducting phase was found in water intercalated sodium cobaltate (Na1−xCoO2·yH2O) with x = 0.65 - 0.7 and y = 0.9 - 1.3. The pairing state is still under debate, but there are some indications for a spin-triplet or p-wave superconducting pairing state. First films of Na1−xCoO2·yH2O with a superconducting transition temperature near 5 K have been successfully grown. Here we report on thin films of Na1−xCoO2 grown by pulsed laser deposition technique. The deposition parameters, sodium deintercalation and water intercalation conditions are tuned in order to obtain the superconducting phase. The instability of this phase might be an indication for triplet superconductivity, which is known to be affected strongly by impurities and defects.This observation is in agreement with the fact that so far also no superconducting thin films of the most famous triplet superconductor Sr2RuO4 have been reported.

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