Regensburg 2025 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 29: Poster II

HL 29.44: Poster

Tuesday, March 18, 2025, 18:00–20:00, P1

Crystal Growth and Influence of Fe³⁺ Doping on the Structural, Optical, and Magnetic Properties of Lead-Free Double Perovskites — •Volodymyr Vasylkovskyi^1,2, Anastasiia Kultaeva¹, Olga Trukhina¹, Patrick Dörflinger¹, Daniele Ludwig¹, Mykola Slipchenko^1,2, and Vladimir Dyakonov¹ — ¹Experimental Physics 6, University of Würzburg, 97074 Würzburg, Germany — ²Institute for Scintillation Materials, NAS of Ukraine, 61072 Kharkiv, Ukraine

Semiconducting perovskite materials have attracted significant attention for their photovoltaic and light-emitting applications, yet their magnetic properties are largely unexplored. Doping perovskites with transition metal ions, such as Fe³⁺, introduces novel properties, broadening their potential for spintronic and quantum applications.
In this study, Fe-doped Cs2AgBiBr6 and Cs2AgBiCl6 single crystals were synthesized using a controlled cooling crystallization technique with varying Fe³⁺ doping concentrations. Despite low Fe³⁺ incorporation (<0.01%), doping significantly affected defect density, optical properties, and magnetic behavior. Electron paramagnetic resonance revealed complex spin properties of the intrinsic spin centers and their interactions, which depend on both temperature and the orientation of single crystals with respect to the magnetic field.
Our findings highlight Fe-doped lead-free perovskites as promising materials for spintronic applications, emphasizing the importance of precise doping and defect manipulation to optimize their performance.

Keywords: Magnetic perovskites; Crystal growth; Iron doping