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Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 57: SC: Fe-based Superconductors - 122 - Thin Films

TT 57.3: Vortrag

Donnerstag, 17. März 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 Holzapfel11IFW 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)

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