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TT: Fachverband Tiefe Temperaturen

TT 23: Correlated Electrons – Poster I

TT 23.17: Poster

Montag, 9. März 2026, 18:00–20:00, P1

Non-equilibrium Charge Dynamics at the metal-insulator transition in κ-(BETS)₂Mn[N(CN)₂]₃ — •Sangeeta Panwar¹, Tim Thyzel¹, Jens Müller¹, Mark Kartsovnik², and Natalia Kushch³ — ¹Institute of Physics, Goethe-Universität Frankfurt, Frankfurt (Main), Germany — ²Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften,Garching, Germany — ³private

Low-dimensional molecular conductors have been shown to host electronic ferroelectricity, where electronic degrees of freedom cause polar order, allowing for fast switching and phase control [1]. Using fluctuation spectroscopy, we recently investigated the nature of electronic ferroelectricity in the organic conductor κ-(BETS)₂Mn[N(CN)₂]₃ [2], representative of a broader class of quasi two-dimensional correlated electron systems. Here, we explore how these phenomena evolve when tuning the bandwidth by applying hydrostatic pressure. We will investigate the slow dynamics of polar nanoregions (PNR) and the evolution of drastic changes in the dynamics as the system is tuned from the insulating to the superconducting phase. By employing fluctuation spectroscopy under pressure, we aim to study how superconductivity emerges from the ferroelectric/multiferroic insulating state and to examine how PNR formation and glassy dipolar freezing evolve [3].
[1] Lang et al., J. Electronic Materials 54, 5087 (2025)
[2] Thomas et al., npj Spintronics 2, 24 (2024)
[3] Zverev et al. PRB 82, 155123 (2010)

Keywords: Metal insulator-transition; Polar nanoregions; Noise; Organic metal; 2D