Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 12: Magnetization Dynamics and Damping

MA 12.8: Talk

Tuesday, March 18, 2025, 11:15–11:30, H19

Dynamics of electronic phase separation at the laser-induced insulator/metal transition in LPCMO — •Maximilian Staabs, Tim Titze, Karen Stroh, Stefan Mathias, Vasily Moshnyaga, and Daniel Steil — I. Physikalisches Institut, Universität Göttingen, Göttingen, Deutschland

The closely related colossal magnetoresistive manganites LCMO and LPCMO exhibit surprising differences in their transient reflectivity dynamics after nanosecond pulsed laser excitation close to their metal-to-insulator transition (MIT). Transient resistance measurements reveal that both systems show transient metallization effects upon laser excitation in the vicinity of the static MIT. These are, however, weak and on the timescale of the laser pulse for LCMO, but much stronger and long-lived for LPCMO. We attribute the differences between these compounds to the presence of mesoscopic electronic phase separation in LPCMO in the MIT region, stabilized by Jahn-Teller polarons [1]. Laser excitation leads to the annihilation of Jahn-Teller distortions [2,3], thus enabling charge transfer between the formerly separated electronic phases. This process is observed as a collapse of the global electrical resistivity on the nanosecond timescale, whereas the recovery of the insulating phase separated state takes nearly 20 nanoseconds [4].

[1] V. Moshnyaga et al., Phys. Rev. B 89, 024420 (2014)

[2] M. Fiebig et al., Appl. Phys. B 71, 211 (2000)

[3] H. Matsuzaki et al., Phys. Rev. B 79, 235131 (2009)

[4] T. Titze et al., Phys. Rev. Research 6, 043168 (2024)

Keywords: Correlated Oxides; optically induced phase Transitions