ICN2 Seminar Hall, ICN2 Building, UAB
Sara Catalano - Department of Quantum Matter Physics, Universite de Geneve, Switzerland
Hosted by: ICREA Prof. Gustau Catalán - Oxide Nanophysics Group Leader at ICN2
Among the family of transition metal oxides (TMO), the perovskite nickelates (RE-NiO3, RE = Rare Earth) stand out for their rich phase diagram, yielding the transition from a Fermi liquid high temperature phase to a charge and magnetically ordered ground state at low temperature. The occurring of the transition can be tuned by a wide spectrum of tools, such as cation substitution, epitaxial strain, electric field effect, optical excitation in the infrared range and pressure, making the RE-NiO3 ideal candidates for the development of novel TMO-based electronic devices. Furthermore, they provide an excellent playground for achieving a deeper understanding of correlated behavior in many-body systems.
Here, I will present an overview of the structural, transport and magnetic properties of high quality epitaxial thin films of SmNiO3 and NdNiO3 deposited on top of a variety of perovskite substrates. In particular, I will illustrate how both the in-plane film/substrate lattice mismatch and the selection of specific crystallographic directions for the film growth allow for an exceptional tuning of the electronic phases of these compounds. Moreover, I will show an in-depth analysis of the RE-NiO3 ground state performed with Resonant Inelastic X-Ray Scattering (RIXS) spectroscopy, providing key information on the electronic configuration of these materials.
 S. Catalano, M. Gibert, V. Bisogni, O. E. Peil, F. He, R. Sutarto, M. Viret, P. Zubko, R. Scherwitzl, A. Georges, G. A. Sawatzky, T. Schmitt and J.-M. Triscone, APL Materials 2, 116110 (2014).
 S. Catalano, M. Gibert, V. Bisogni, F. He, R. Sutarto, M. Viret, P. Zubko, R. Scherwitzl, G. A. Sawatzky, T. Schmitt and J.-M. Triscone, APL Materials 3, 062506 (2015).
 V. Bisogni, S. Catalano, R. J. Green, M. Gibert, R. Scherwitzl, Y. Huang, V. N. Strocov, P. Zubko, S. Balandeh, J.-M. Triscone, G. Sawatzky & T. Schmitt, Nature Communications 7, 13017 (2016).