Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 42: Posters Magnetism I

MA 42.21: Poster

Wednesday, March 18, 2020, 15:00–18:00, P3

Ultrafast Photoinduced Spin Dynamics and Transmission Transients in the Strongly Correlated Manganite Pr_0.9Ca_0.1MnO₃. — •Tim Titze¹, Hendrik Meer¹, Birte Kressdorf², Andreas Weisser¹, Cinja Seick¹, Henning Ulrichs¹, Dennis Meyer¹, Christian Jooss², Daniel Steil¹, and Stefan Mathias¹ — ¹1st Physical Institute, University of Goettingen — ²Institute for Materials Physics, University of Goettingen

We investigate spin and quasiparticle dynamics of a thin Pr_0.9Ca_0.1MnO₃ (PCMO) film, using time resolved transient transmission and magneto-optical Kerr measurements. A cryostat provides the opportunity to study the temperature-dependent properties of this strongly correlated manganite in a temperature range of 20 K - 300 K. At low temperatures (<100 K) we observe a ferromagnetic phase using TR-MOKE, which can be connected to features observed in transient transmission data. The data shows an initial ultrafast increase in magnetization on a sub-ps timescale, followed by a slower demagnetization within tens of ps. In further transient transmission measurements we observe an ultrafast transmission change within less than a picosecond and a slow 100 ps - 1 ns relaxation component, whose T-dependence hints at a proposed phase transition out of the low-temperature orbitally ordered phase around 200 K.