Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 62: Correlated Electrons – Poster II
TT 62.2: Poster
Mittwoch, 11. März 2026, 15:00–17:00, P4
Magnetic polarons in antiferromagnetic EuCd2P2 with systematic impurities — •Dominik Hoff, Julian Beu, Sarah Krebber, Kristin Kliemt, Cornelius Krellner, and Jens Müller — Goethe-University Frankfurt, Germany
Strong interactions between charge carriers and magnetism can give important insights on the physics of correlated electron systems. The colossal magnetoresistance (CMR) is one such effect, that is promising for applications. We are investigating EuCd2P2, which shows a strong CMR-effect above its antiferromagnetic transition [1]. In previous works, it was possible to link the CMR-effect to the existence and percolation of magnetic polarons resulting in a strong increase in low-frequency resistance fluctuations at the CMR-peak caused by the onset of polaron percolation. It was also found that the CMR-effect of EuCd2P2 is strongly sensitive to the sample’s growth conditions [2]. To further examine these dependencies, we investigate systematic structural differences in the form of chemical substitutions. In this work we aim to investigate behavioural changes of magnetic polarons due to the substitution of Silicon in the growth process of EuCd2P2. We analyze the Hall effect, higher-harmonic resistance and resistance fluctuations as a function of temperature and magnetic field aiming to systematically determine the impact of structural impurities on polaron dynamics.
[1] Phys. Rev. B 109 (2024) 104421
[2] arXiv2503.24059
Keywords: Magnetic Polarons; AFM; CMR; Fluctuation spectroscopy