Deposition and properties of Fe(Se,Te) thin films on vicinal CaF2 substrates

Bryja H, Huehne R, Iida K, Molatta S, Sala A, Putti M, Schultz L, Nielsch K, Haenisch J (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Superconductor Science & Technology Institute of Physics: Hybrid Open Access

Book Volume: 30

Article Number: 115008

Journal Issue: 11

DOI: 10.1088/1361-6668/aa8421

Abstract

We report on the growth of epitaxial Fe1+δSe0.5Te0.5 thin films on 0°, 5°, 10°, 15° and 20° vicinal cut CaF2 single crystals by pulsed laser deposition. In situ electron and ex situ x-ray diffraction studies reveal a tilted growth of the Fe1+δSe0.5Te0.5 films, whereby under optimized deposition conditions the c-axis alignment coincides with the substrate [001] tilted axis up to a vicinal angle of 10°. Atomic force microscopy shows a flat island growth for all films. From resistivity measurements in longitudinal and transversal directions, the ab- and c-axis components of resistivity are derived and the mass anisotropy parameter is determined. Analysis of the critical current density indicates that no effective c-axis correlated defects are generated by vicinal growth, and pinning by normal point core defects dominates. However, for H||ab the effective pinning centers change from surface defects to point core defects near the superconducting transition due to the vicinal cut. Furthermore, we show in angular-dependent critical current density data a shift of the ab-planes maxima position with the magnetic field strength.

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE) Nagoya University / 名古屋大学 JP Japan (JP) Helmholtz-Zentrum Dresden-Rossendorf (HZDR) DE Germany (DE) University of Genova / Università degli Studi di Genova IT Italy (IT) Karlsruhe Institute of Technology (KIT) DE Germany (DE)

How to cite

APA:

Bryja, H., Huehne, R., Iida, K., Molatta, S., Sala, A., Putti, M.,... Haenisch, J. (2017). Deposition and properties of Fe(Se,Te) thin films on vicinal CaF2 substrates. Superconductor Science & Technology, 30(11). https://doi.org/10.1088/1361-6668/aa8421

MLA:

Bryja, Hagen, et al. "Deposition and properties of Fe(Se,Te) thin films on vicinal CaF2 substrates." Superconductor Science & Technology 30.11 (2017).

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