SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Ultrafast Magnetization Effects II
MA 46.8: Vortrag
Freitag, 31. März 2023, 11:15–11:30, HSZ 02
Dynamic versus Static Spectral Weight Transfer in LPCMO Thin Films — •Karen P. Stroh, Tim Titze, Pia Henning, Daniel Steil, Stefan Mathias, and Vasily Moshnyaga — I. Physikalisches Institut, Georg-August-Universität Göttingen, DE
(La1−yPry)1−xCaxMnO3 (LPCMO) is a prototypical bandwidth-controlled manganite with strong electron-phonon coupling and colossal magnetoresistance (CMR), originating from a nm-scale phase separation with ferromagnetic nanodomains antiferromagnetically coupled by correlated Jahn-Teller polarons (CPs).
The present study made use of strain-engineered LPCMO thin films prepared by a metalorganic aerosol deposition technique on LAO-buffered STO(100) substrates. Temperature-dependent static reflectivity spectra, showing the phase-transition-mediated spectral weight transfer (SWT), served as reference for identifying thermally driven behaviour. Further, pump-probe reflectivity (PPR) and time-resolved magneto-optical-Kerr effect (MOKE) data at different temperatures and probe wavelengths provided insights into the role of CPs in ultrafast electron and magnetization dynamics on femto- to nanosecond timescales.
As a main result, we observed a long-lived non-thermal state with increased optical conductivity in the polaron hopping regime at a probe energy of 0.7eV, indicating the destruction of polarons or a loss of their correlation upon laser excitation.
Financial support by the German Research Foundation DFG (project 399572199 and CRC 1073/A02) is acknowledged.