Dresden 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DS: Fachverband Dünne Schichten

DS 32: Poster: Optical Analysis of Thin Films

DS 32.5: Poster

Mittwoch, 18. März 2020, 15:00–18:00, P1A

Effect of lattice strain on the surface structure of epitaxial manganite thin films — •Leonard Schüler, Jonas Wawra, Sebastian Merten, and Vasily Moshnyaga — I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

Our recent study of the surface-enhanced Raman spectroscopy (SERS) revealed that La_0.7Sr_0.3MnO₃ (LSMO) thin films grown in a stress-free state on MgO(200) substrates possess an electron-enriched surface, that manifests itself by the appearance of strong Jahn-Teller stretching and antistretching modes in SERS spectra [1]. Here we were focusing on the effect of epitaxy strain on the surface structure of LSMO films, grown on LaAlO₃, SrTiO₃ and sapphire substrates by a metalorganic aerosol deposition (MAD) technique. Raman intensity of the substrate background has been reduced by optimizing the confocal setup of the spectrometer. The surface structure was then determined by comparing the conventional Raman spectra of films with their respective SERS spectra, obtained by coating the films with Au nanoparticles using the same MAD. Furthermore, the influence of the MAD surface modification on the SERS spectra has been investigated. Financial support of the DFG via SFB1073 is acknowledged.

[1] S. Merten et al. Phys. Rev. Mater. 3, 060401(R) (2019)