Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Superconductivity: Fe-based Superconductors - FeSe and others
TT 59.9: Vortrag
Donnerstag, 23. März 2017, 11:45–12:00, HSZ 103
The quest for LaFeAsO single crystals — •Rhea Kappenberger1,2, Saicharan Aswartham1, Sebastian Selter1, Francesco Scavaraggi1,2, Federico Caglieris1, A. U. B. Wolter1, Christian Hess1,3, Hans-Joachim Grafe1, Sabine Wurmehl1,2, and Bernd Büchner1,2,3 — 1Leibniz Institute for Solid State and Materials Research Dresden IFW, Dresden, Germany — 2Institut für Festkörperphysik, TU Dresden, 01069 Dresden, Germany — 3Center for Transport and Devices, TU Dresden, 01069 Dresden, Germany
Since the discovery of Fe-based superconductors in 2008, a lot of progress in crystal growth has been made in the 11, 111 and 122 systems. However, in the 1111 systems large crystals of high quality are very difficult to obtain, which renders investigations which crucially rely on single crystals, e.g. investigations of nematicity, practically impossible.
In this work, we present a novel approach of obtaining large La(Fe,Co)AsO and LaFeAs(O,F) single crystals using solid state synthesis and flux growth under ambient pressure. We were able to map out a new electronic phase diagram using single crystals of La(Fe,Co)AsO by several techniques such as structural, magnetic and resistivity measurements.