Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: SC: Fabrication and Characterization of Iron-Based and Other Superconductors

TT 20.11: Vortrag

Mittwoch, 24. März 2010, 12:15–12:30, H19

Preparation and Characterization of Ho_xLu_1−xNi₂B₂C Thin Films — •Tim Niemeier, Karolin Tscharntke, Ruben Hühne, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, PF 270116, D-01171 Dresden

On the basis of the epitaxial growth of rare earth nickel borocarbide films [1], mixed phase borocarbide thin films Ho_xLu_1−xNi₂B₂C were successfully prepared for the first time. Pulsed Laser deposition with two stoichiometric LuNi₂B₂C and HoNi₂B₂C alloy targets and variable pulse counts on both targets were used to produce thin films with different chemical compositions. Using x-ray diffraction, a homogeneous phase was detected in the films. Texture measurements revealed that for most of the compositions, a high in-plane order could be preserved in the films for slighty adapted deposition parameters. The superconductive transition temperatures in dependence of the composition are close to those known from mixed phase polycrystalline samples [2]. Finally, an outlook to the behaviour of the upper critical field in the composition series will be given. Additional details on the deposition and the epitaxial growth will be discussed on an additional poster.

[1] T. Niemeier et al., J. Phys.: Conf. Ser. 150 (2009) 052185

[2] J. Freudenberger et al.: J. Magnetism and Magnetic Materials 187 (1998) Nr. 3, S. 309-317