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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 Kappenberger^1,2, Saicharan Aswartham¹, Sebastian Selter¹, Francesco Scavaraggi^1,2, Federico Caglieris¹, A. U. B. Wolter¹, Christian Hess^1,3, Hans-Joachim Grafe¹, Sabine Wurmehl^1,2, and Bernd Büchner^1,2,3 — 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.