Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.2: Poster

Montag, 27. März 2006, 14:00–17:45, P1

Rare Earth Nickel Borocarbide Thin Films and Related Compounds — •Tim Niemeier, Ruben Hühne, Günter Behr, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, P.O. Box 270116, 01171 Dresden

Epitaxial thin films of YNi₂B₂C and related rare earth borocarbide compounds have been found to be a suitable alternative to single crystal growth for the characterisation of usual superconducting properties such as T_c, H_c2 and J_c . Comparable results concerning the anisotropy require a good texture quality. For YNi₂B₂C, a new buffer layer architecture was developed, which improves both epitaxial growth and texture quality. The films were grown by pulsed laser deposition from stoichiometric and multicomponent molten targets under ultra-high vacuum conditions. Bare as well as buffered ceramic single crystals were used as substrates. Additionally, thin films of modified phase compositions such as Y(Pt_xNi_1−x)₂B₂C were investigated and the influence of disorder on the superconducting properties was studied. The critical temperature, the critical current density and also the properties of the upper critical field were determined and compared to polycrystal data.