Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 37: Correlated Electrons: Poster
TT 37.36: Poster
Mittwoch, 19. März 2025, 15:00–18:00, P4
Resistance Fluctuation (Noise) Spectroscopy in EuS and LiCu3O3 — •Philipp Swoboda1, Demian Ranftl1, Nazia Kaya1, Katharina Zoch1, Kristin Kliemt1, Simon Moser2, Cornelius Krellner1, and Jens Müller1 — 1Institute of Physics, Goethe-University Frankfurt, Frankfurt (Main), Germany — 2Institute of Physics, University Würzburg, Würzburg, Germany
Noise spectroscopy gives insights into the low-frequency dynamics of charge carriers in condensed-matter systems, which is energy-resolved information that can’t be obtained from mean values alone. Here the interest lies in 1/fα-noise, which can be described as a superposition of independent two-level processes. For instance it has been used to identify energy scales of thermally-activated switching processes like fluctuating polar nanoregions (PNR) in the past [1, 2]. In general the processes observed by resistance fluctuation are sensitive to slow dynamics. Examples are the slowing down of charge carriers in the vicinity of a metal insulator transition and the freezing of PNR at the onset of glassy dynamics. This work aims to use noise spectroscopy as a function of temperature and magnetic field in order to investigate how magnetic polarons influence the colossal magnetoresistance in the ferromagnetic semiconductor EuS, as well as to investigate the exotic electron glass phase in LiCu3O3.
[1] npj Spintronics 2, 24 (2024).
[2] Meas. Sci. Technol. 36 (2025) 015501.
Keywords: Slow dynamics; Electron glass state; Colossal MR