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End date: 2022 × End date: 2019 × Start date: 2019 × DDC: 530 × Type: ConferenceObject × Type: Text ×

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    On the growth of Co-doped BaFe2As2 thin films on CaF2
    (Bristol : IOP Publ., 2019) Langer, Marco; Meyer, Sven; Ackermann, Kai; Grünewald, Lukas; Kauffmann-Weiss, Sandra; Aswartham, Saicharan; Wurmehl, Sabine; Hänisch, Jens; Holzapfel, Bernhard
    The competition between phase formation of BaF2 and Ba(Fe1-xCox)2As2 on CaF2 single crystals has been analysed. Ba(Fe0.92Co0.08)2As2 thin films have been deposited by pulsed laser deposition. X-ray diffraction, atomic force microscopy and scanning electron microscopy studies have revealed that the formation of secondary phases and misorientations as well as the growth modes of the Ba(Fe0.92Co0.08)2As2 thin films strongly depend on the growth rate. At high growth rates, formation of BaF2 is suppressed. The dependency of the Ba(Fe0.92Co0.08)2As2 lattice parameters supports the idea of fluorine diffusion into the crystal structure upon suppression of BaF2 formation similar as was proposed for FeSe1-xTex thin films on CaF2. Furthermore, a growth mode transition from a layer growth mechanism to a three-dimensional growth mode at high supersaturation has been found, suggesting similarities between the growth mechanism of iron-based superconductors and high-T c cuprate thin films. © 2019 Published under licence by IOP Publishing Ltd.
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    Soil conditions and the iron chlorosis of mature vine
    (London [u.a.] : Institute of Physics, 2019) Yutsis, A.E.; Zhelezova, S.V.; Dammer, K.-H.
    Iron-deficiency chlorosis is a usual routine problem on calcareous carbonated soils of Crimea. Different reasons cause vine chlorosis: soil properties, physiological status of plants and others. It was shown that chlorosis spot in the vineyard has constant location. Chlorosis can be identified visually and instrumentally. In this study, an attempt was made to find the relationship between soil electrical resistance and the spread of vine chlorosis.