SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Poster Session: Superconductivity
TT 5.10: Poster
Montag, 27. September 2021, 13:30–16:00, P
Growth and characterisation of substitution variants of LaOFeAs single crystals — •Felix Anger1, Christian Blum1, Anja Wolter-Giraud1, Sebastian Gaß1, Hans-Joachim Grafe1, Saicharan Aswartham1, Sabine Wurmehl1,2, and Bernd Büchner1,2 — 1Leibniz Institute for Solid State and Materials Research, IFW, Dresden, Germany — 2Institute of Solid State and Materials Physics, TU Dresden, Dresden, Germany
Facetted LaOFeAs single crystals with considerably growth in the crystallographic c direction were first reported by R. Kappenberger et al. [1]. The growth process takes place via diffusion in solid state, the so-called Solid State Crystal Growth (SSCG) method. The single crystals are grown from a polycrystalline matrix by the introduction of NaAs as a liquid phase to aid the crystallization process.1 Here, we present some additional experimental findings regarding growth temperature, initial microstructure and the role of NaAs for the growth. Furthermore, we are aiming to grow novel series of crystals of substitution variants as, e.g., Co-doped SmOFeAs and LaO1-xFxFeAs. The crystals were characterized regarding their composition, structure and magnetic properties.
[1] R. Kappenberger et al., Journal of Crystal Growth 483, 9-15 (2018)