Quantum 2025 – wissenschaftliches Programm

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MON: Monday Contributed Sessions

MON 23: Poster Session: Fundamental Aspects and Model Systems

MON 23.47: Poster

Montag, 8. September 2025, 18:30–20:30, ZHG Foyer 1. OG

Novel Medium- and High-Entropy Telluride Thin Films via Hybrid Pulsed Laser Deposition — •Niklas Kohlrautz, Pia Henning, Helmut Klein, Heidrun Sowa, and Jasnamol Palakkal — Institute of Materials Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Medium- and high-entropy materials (MEMs and HEMs) are known for their great multifunctional properties, ranging from catalytic activity to magnetic order [1]. Moreover, tellurides (e.g., CrTe, FeGeTe, and CrGeTe) have gained large interest for their highly tunable magnetic properties, including room-temperature ferromagnetism and perpendicular magnetic anisotropy [2]. Toward the goal of synthesizing novel HEMs, we designed a hybrid Pulsed Laser Deposition (PLD) technique with Te molecular beam source attached. After primarily establishing the growth of Cr_(1+δ)Te₂, we synthesized a novel MEM telluride, FeCrNiTe (FCNT), using a PLD target containing the transition metals and supplying Te via the beam source. Growth parameter optimization yielded high-quality epitaxial thin films. We present a detailed structural and physical characterization of a series of FCNT thin films deposited on SrTiO₃(100) substrates. Orthorhombic crystal structure, highly homogeneous surface, semiconducting behavior, and a low magnetoresistance at low temperatures were identified in these novel MEM tellurides. This work pioneers the synthesis of many novel MEM and HEM tellurides that have potential in future spintronics devices.

[1] N. Oueldna, Materials Horizons 2024, 11(10), 2323-2354.

[2] A. Tschesche et al., R.S., doi.org/10.21203/rs.3.rs-4861088/v1.

Keywords: Pulsed Laser Deposition; Molecular Beam Epitaxy; Medium-Entropy Materials; High-Entropy Materials; Tellurides