Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.95: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Time evolution of laser-induced changes in electric transport of manganites — •Manuel Mchalwat, Bernd Damaschke, Vasily Moshnyaga, Markus Münzenberg, and Konrad Samwer — 1. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

Manganites show structural phenomena at a variety of spatial and time scales ranging from nanometers and picoseconds for single polarons up to microns and seconds for the electronic phase separation. Many of these influence physical properties, e. g. the metal-insulator transition, which is accompanied by a change of the crystal structure and believed to be driven by the formation of correlated polarons near the transition temperature.

By exciting the sample near the transition by short laser pulses we induce or destroy the electronic correlations, i. e. the correlated polarons, and investigate their time development by looking at the electronic transport properties, especially the third harmonic contribution, which is sensitive to the density of polarons.

The work has been supported by the DFG through SFB 1073 TP B01 and by Femtolasers.