Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Fabrication and Characterization
TT 18.4: Vortrag
Dienstag, 24. März 2009, 14:45–15:00, HSZ 105
Texture and anisotropy of PLD-grown superconducting LuNi2B2C thin films — •Tim Niemeier1, Ruben Hühne1, Günter Fuchs1, Anke Köhler2, Günther Behr2, Ludwig Schultz1, and Bernhard Holzapfel1 — 1Institute for Metallic Materials, IFW Dresden, P.O. Box 270116, D-01171 Dresden — 2Institute for Solid State Physics, IFW Dresden, P.O. Box 270116, D-01171 Dresden
Epitaxial thin films of LuNi2B2C were deposited on MgO single crystal substrates using Pulsed Laser Deposition from a stoichiometric target. The film thicknesses are around 200 nm. For optimized deposition parameters, a sharp c-axis texture, high in-plane order and a good reproducibility were achieved. The residual resistivity is around 5 µΩ cm, which is about 2-3 times higher than the best values reported for single crystals, resulting in RRR values of about 15. The temperature behaviour of the upper critical field was measured using a Quantum Design PPMS between 2K and Tc and reveals a significantly higher Hc2 than in single crystals whereas the anisotropic behaviour of Hc2 is qualitatively similar. Potential reasons for the increase of Hc2 are discussed.