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arXiv · 1111.3923

Generic Fe buffer layers for Fe-based superconductors: Epitaxial FeSe1-xTex thin films

Kazumasa Iida·Jens Haenisch·Michael Schulze·Saicharan Aswartham·Sabine Wurmehl·Bernd Buechner·Ludwig Schultz·Bernhard Holzapfel
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Abstract

Biaxially textured FeSe1-xTex films have been realized on Fe-buffered MgO substrates by pulsed laser deposition. Similar to the Fe/BaFe2As2 bilayers, the crystalline quality of FeSe1-xTex films exhibit a sharp out-of-plane and in-plane texture less than 0.9°. The Fe/FeSe1-xTex bilayers showed high superconducting transition temperatures of over 17 K. The angular-dependent critical current densities exhibit peaks positioned at H // ab similar to other pnictide thin films. The volume pinning force of FeSe1-xTex in this direction is very strong compared with that of Co-doped BaFe2As2, due to a good matching between the interlayer distance in the c direction and the out-of-plane coherence length.

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Kazumasa Iida, Jens Haenisch, Michael Schulze, Saicharan Aswartham, Sabine Wurmehl, Bernd Buechner, Ludwig Schultz, Bernhard Holzapfel. 2011-11-16. Generic Fe buffer layers for Fe-based superconductors: Epitaxial FeSe1-xTex thin films. https://doi.org/10.1063/1.3660257

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