Low anisotropic upper critical fields in SmO1−xFxFeAs thin films with a layered hybrid structure
Low anisotropic upper critical fields in SmO1−xFxFeAs thin films with a layered hybrid structure
Haindl, S.; Kampert, E.; Sasase, M.; Hiramatsu, H.; Hosono, H.
We report on the upper critical fields in SmO1−xFxFeAs thin films prepared by pulsed laser deposition. With an F-content gradient along their thickness, the films could be described approximately as layered two-phase hybrid structures comprised of one superconducting layer and one antiferromagnetic layer. An analytical characterization of different thin film samples by Auger electron spectroscopy and energy-dispersive x-ray spectroscopy in scanning transmission electron microscopy is provided and structural defects, such as antiphase boundaries, were confirmed for films grown at lower deposition temperatures. Electrical transport measurements in pulsed magnetic fields yielded upper critical fields higher than 80 T with an anisotropy γHc2 ≤ 2.25.
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Superconductor Science and Technology 32(2019), 044003
DOI: 10.1088/1361-6668/aafe3d
Cited 11 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-28988
Publ.-Id: 28988