Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.5: Poster

Montag, 31. März 2014, 15:00–19:00, P2

Thick BaHfO₃ doped YBa₂Cu₃O_7−δ films on textured Ni-W tapes — •Max Sieger¹, Jens Hänisch¹, Kazumasa Iida¹, Uwe Gaitzsch¹, Christian Rodig¹, Rainer Nast², Ludwig Schultz¹, Bernhard Holzapfel², and Ruben Hühne¹ — ¹Institute for Metallic Materials, IFW Dresden, PO Box 27 01 16, D-01171 Dresden, Germany — ²Institute for Technical Physics, Karlsruhe Institute of Technology (KIT), PO Box 36 40, D-76021 Karlsruhe

High-temperature superconductors grown on metallic tapes (coated conductors) might be used in a wide range of applications such as electric cables, MRI and fusion magnets. To achieve highest transport currents in magnetic fields, flux lines have to be immobilized by introducing nanoscaled pinning centres. In this study, we have prepared YBa₂Cu₃O_7−δ (YBCO) thick films (∼ 1 µm) with different amounts of BaHfO₃ (BHO) on highly alloyed biaxially textured Ni-W tapes by pulsed laser deposition and discuss the effect of deposition parameters and BHO contents on the superconducting properties. X-Ray diffraction showed a good texture transfer from the nickel alloy tape via the buffer system to the superconducting layer. In general, a superconducting transition temperature T_c of about 88 K with a small transition width was determined. The incorporation of artificial pinning centres led to improved in-field critical current densities J_c(µ₀H) and to an increase of the irreversibility field H_irr.