Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 53: Poster Session: Superconductivity 1

TT 53.10: Poster

Wednesday, March 22, 2017, 15:00–19:00, P2-OG2

Crystal growth and characterization of NdFeAs(O,F) — •Agnes Adamski, Mahmoud Abdel-Hafiez, and Cornelius Krellner — Physikalisches Institut, Goethe University Frankfurt

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 so-called 1111 systems, the focus has been rapidly shifted towards other materials, were large high-quality single crystals are available. In contrast, the growth of sizable high-quality single crystals of 1111 compounds is extremely challenging, slowing down the scientific progress in this type of compounds.
Here, we report on the crystal growth of fluorine doped NdFeAsO under ambient pressure conditions by using the flux-growth technique. With this method we were able to grow single crystals up to 800 µm size and with superconducting transitions temperatures above 50 K. Subsequently, the obtained samples were analyzed with powder diffractometry, electron probe micro analysis, magnetic and transport measurements to determine the structural and physical properties. Using high-pressure electric resistance measurements on these crystals, we demonstrate a tentative p−T phase diagram.