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Structure and orbital ordering of ultrathin LaVO3 probed by atomic resolution electron microscopy and Raman spectroscopy |
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| Authors: | Ionela Lindfors‐Vrejoiu Lei Jin Cameliu Himcinschi Johannes Engelmayer Felix Hensling Chun‐Lin Jia Rainer Waser Regina Dittmann Paul H. M. van Loosdrecht |
| Affiliation: | 1. +49 373 139 2862;2. II. Physikalisches Institut, Universit?t zu K?ln, K?ln, Germany;3. Peter Grünberg Institut (PGI‐5) and Ernst Ruska‐Centre for Microscopy and Spectroscopy with Electrons (ER‐C), Forschungszentrum Jülich GmbH, Jülich, Germany;4. Institut für Theoretische Physik, TU Bergakademie Freiberg, Freiberg, Germany;5. Peter Grünberg Institut (PGI‐7), Forschungszentrum Jülich GmbH, Jülich, Germany |
| Abstract: | Orbital ordering has been less investigated in epitaxial thin films, due to the difficulty to evidence directly the occurrence of this phenomenon in thin film samples. Atomic resolution electron microscopy enabled us to observe the structural details of the ultrathin LaVO3 films. The transition to orbital ordering of epitaxial layers as thin as ≈4 nm was probed by temperature‐dependent Raman scattering spectroscopy of multilayer samples. From the occurrence and temperature dependence of the 700 cm–1 Raman active mode it can be inferred that the structural phase transition associated with orbital ordering takes place in ultrathin LaVO3 films at about 130 K. |
| Keywords: | LaVO3 perovskites phase transitions structure orbital ordering thin films Raman spectroscopy electron microscopy |