Film growth and anisotropic behaviour of the critical field in epitaxial LuxHo1-xNi2B2C thin films

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 Waelte et al. from specific heat measurements and thermodynamic simulations that LuNi2B2C provides a non-magnetic corresponding partner of HoNi2B2C. 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. We prepared epitaxial thin films of alloys of LuxHo1-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