Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 43: Superconductivity: Fe-based Superconductors – 122
TT 43.3: Vortrag
Dienstag, 17. März 2015, 14:45–15:00, H 2053
Crystal growth and characterization of SrFe2(As1−xPx)2 — •Agnes Adamski, Fadoua Fouta, and Cornelius Krellner — Physikalisches Institut, Goethe Universität Frankfurt, D-60438 Frankfurt am Main, Germany
Among the various iron-arsenide-based superconductors, members of the AFe2As2 (A = Ba, Sr, Ca), the so called 122 family, have become model systems for exploring superconductivity in this new class of high-TC superconductors. Recently it turned out, that the different substitution series result in very different temperature-concentration phase diagrams, especially in the region where antiferromagnetism disappears and superconductivity emerge. Furthermore, the symmetry of the superconducting order parameter tends to vary from one substitution series to another.
Here, we report on the optimization of the single crystal growth of SrFe2(As1−xPx)2 using the well-established self-flux technique. However, so far the exact melting temperatures of various flux to 122 compositions are not reported in the literature. We performed differential thermal analysis (DTA) to determine these melting points as function of flux to 122 ratio and for various phosphorous concentrations. Subsequently, the obtained samples were analyzed with electron microscope, energy dispersive x-ray analysis and powder diffractometry to determine the phase relations and distribution coefficients in this series.