Regensburg 2025 – scientific programme
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DS: Fachverband Dünne Schichten
DS 13: Poster
DS 13.64: Poster
Thursday, March 20, 2025, 18:00–20:00, P1
Tailoring Metavalent Materials: Exploring the Structural and Functional Properties of (GeTe)x(SnTe)1-x Alloys — •Jari Klinkmann1, Lucas Bothe1, Felix Hoff2, and Matthias Wuttig1,2 — 1Peter Grünberg Institute - JARA-Institute Energy Efficient Information Technology (PGI-10), Jülich, Germany — 2I. Institute of Physics (IA), RWTH Aachen University, Germany
Metavalent materials have attracted significant interest due to their unique property portfolio, including medium electrical conductivities, high optical dielectric constants, large Born effective charges, and high Grüneisen parameters. GeTe and SnTe in particular are highly relevant for applications in thermoelectrics and phase-change memories. Here, we provide a comprehensive study of (GeTe)x(SnTe)1-x alloys fabricated using molecular beam epitaxy (MBE). Structural characterization using x-ray diffraction alongside polarization-resolved Raman spectroscopy reveal the stoichiometry dependence of the rhombohedral-to-cubic phase transition, characterized by the loss of Raman-active modes in the cubic phase. Furthermore, coherent phonon investigations captured via femtosecond pump-probe spectroscopy detail the phase transition temperature evolution. Electrical and optical characterizations demonstrate the impact of stoichiometry on material properties, highlighting opportunities for tailoring these alloys for advanced technological applications.
Keywords: Phase Change Materials (PCM); Thermoelectrics; Metavalent Bonding (MVB); Femtosecond Pump Probe Spectroscopy; Molecular Beam Epitaxy (MBE)