Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 15: Superconductivity: Poster Session

TT 15.3: Poster

Tuesday, February 26, 2008, 14:00–18:00, Poster B

Film growth and anisotropic behaviour of the critical field in epitaxial Lu_xHo_1−xNi₂B₂C thin films — •Tim Niemeier, Ruben Hühne, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, P.O. Box 270116, 01171 Dresden

The research on Rare Earth Nickel Borocarbides has led to a number of new conclusions about superconductivity, particularly in regard to the interdependency with magnetic influences. Recently, it was concluded by Wälte et al. from specific heat measurements and thermodynamic simulations that LuNi₂B₂C provides a non-magnetic corresponding partner of HoNi₂B₂C [1].

Complementary to single crystal growth, we use pulsed laser deposition for the sample preparation. In the past, particularly the anisotropy of the upper critical field could be successfully measured using thin film samples [2]. We prepared epitaxial thin films of alloys of Lu_xHo_1−xNi₂B₂C for different x for the investigation of the transition temperature and the upper critical field. Especially we discuss the anisotropic behaviour above as well as below the magnetic ordering temperature known from HoNi₂B₂C providing numerical fitting results for different simple models.

[1] Wälte, A: Doctoral thesis, TU Dresden 2007

[2] Wimbush, S. C., L. Schultz, and B. Holzapfel: Angular anisotropy of the upper critical field in YNi₂B₂C. Physica C 408-10 (2004): 83-84.