Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 80: Low-Dimensional Systems - Poster Session

TT 80.9: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P2

Phase Transitions in Nickelate Thin Films and Superlattices Studied by Raman Light Scattering — •Matthias Hepting, Mathieu Le Tacon, Eva Benckiser, Matteo Minola, Friederike Wrobel, Dmitry Kukuruznyak, Georg Christiani, Gennady Logvenov, and Bernhard Keimer — Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany

Recent work on heterostructures based on rare-earth nickelates revealed that it is possible to control their magnetic and electronic properties by epitaxial strain and spatial confinement [1,2]. To gain a deeper understanding of the correlation between the electronic and the structural phase transitions, we have developed an advanced method of Raman spectroscopy which enables the study of heterostructures as thin as ∼10nm.

Here we present temperature-dependent Raman spectra of PrNiO₃ based thin films and superlattices in different strain states and with different periodicities. We will discuss how signatures of a charge ordered ground state are mirrored in the Raman spectrum of tensile strained PrNiO₃ and how this observation can give deeper insights on the character of the ground state of rare-earth nickelates [3].
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