Regensburg 2016 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Superconductivity: Fe-based Superconductors - 1111 & 111

TT 25.1: Talk

Tuesday, March 8, 2016, 09:30–09:45, H19

Crystal growth and characterization of REFeAsO ( RE = La, Nd) and LaFePO — •Agnes Adamski, Mahmoud Abdel-Hafiez, and Cornelius Krellner — Physikalisches Institut, Goethe Universität, D-60438 Frankfurt am Main

Since the discovery of iron-based superconductors, much effort was put on the crystal growth of the various systems and their characterization. Although, the initial flurry of activities was mainly performed on the 1111 systems, the focus has been rapidly shifted towards other materials, were large high-quality crystals are available. In contrast, the growth of sizeable high-quality single crystals of 1111 compounds is extremely challenging, slowing down the scientific progess in this type of compounds.

Here we report on the crystal growth of 1111-type materials under ambient pressure conditions and by using the flux technique. The influence of the material to flux ratio was systematically studied. Subsequently, the obtained samples were analyzed with powder diffractometry, electron microscope, energy dispersive x-ray analysis, Laue diffractometry and magnetic measurements to analyze the structural and magnetic properties.