Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Poster Session

TT 30.1: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P1

Optimization of single-crystal growth of Fe(Se,S) — •Maik Golombiewski, Teslin Rose Thomas, N. S. Sangeetha, Andreas Kreyßig, and Anna E. Böhmer — Lehrstuhl für Experimentalphysik IV, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum

The iron-based superconductor FeSe and its substitution series Fe(Se,S) have been studied intensively for over a decade. Large (mm-sized) homogeneous single crystals are highly desirable for the accurate characterization of this material. An effective technique to grow Fe(Se,S) single crystals is chemical vapor transport with Cl-salts. However, the sulfur substitution makes the growth of large single crystals harder the higher the substitution percentage is.

We examine which parameters have an influence on the size and homogeneity of our Fe(Se,S) single crystals, namely furnace tilt, quartz ampoule dimensions and form, starting material preparation and temperature gradient. The composition of the single crystals is analyzed with a scanning electron microscope and properties are characterized by resistance measurements as well as x-ray diffraction experiments.

We find that we can consistently grow single crystals with masses ranging from 3 mg to more than 10 mg, depending on S-content. Other types of chemical substitution are explored.