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TT: Fachverband Tiefe Temperaturen
TT 57: SC: Fe-based Superconductors - 122 - Thin Films
TT 57.3: Talk
Thursday, March 17, 2011, 17:45–18:00, HSZ 304
Epitaxial growth of superconducting Ba(Fe1−xCox)2As2 thin films on IBAD-MgO buffered metallic substrates — •Jens Hänisch1, Kazumasa Iida1, Sascha Trommler1, Vladimir Matias2, Tom Thersleff1, Fritz Kurth1, Irene Lucas del Pozo1, Jan Engelmann1, Silvia Haindl1, Ruben Hühne1, Ludwig Schultz1, and Bernhard Holzapfel1 — 1IFW Dresden, P. O. Box 270116, 01171 Dresden, Germany — 2MPA-STC, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
Recently we have shown that thin Fe buffer layers are beneficial for the growth of high-quality Ba(Fe1−xCox)2As2 (Ba-122) thin films.[1] Even on MgO with large lattice mismatch, epitaxial growth can be achieved with Fe buffer. Here, we report on the biaxially textured growth of superconducting Ba-122 thin films on metallic technical tapes with an ion beam assisted deposition MgO (IBAD-MgO) and Fe buffer architecture. The epitaxial relation was confirmed to (001)[100]Ba-122||(001)[110]Fe||(001)[100]MgO by XRD θ-2θ scans and pole figure measurements. The iron pnictide layer showed a Tc of 21.5 K, which is only slightly lower than on single-crystal MgO substrates. The angular-dependent critical current density, Jc(θ), showed a broad maximum at θ = 90∘ and a lower Jc anisotropy than films on single-crystalline substrates. A self-field Jc of 8×105 A/cm2 has been achieved at 4 K.
T. Thersleff et al., APL 97, 022506 (2010);
K. Iida et al., APL 97, 172507 (2010)