| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Rusydi, Andrivo
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (5/5 displayed)
- 2023A Facile Two-Step Hydrothermal Synthesis of Co(OH)2@NiCo2O4 Nanosheet Nanocomposites for Supercapacitor Electrodescitations
- 2023Unrevealing tunable resonant excitons and correlated plasmons and their coupling in new amorphous carbon-like for highly efficient photovoltaic devicescitations
- 2018Design, fabrication, and characterisation of wire grid polarizers for the deep UV spectral rangecitations
- 2017Investigation of the metal-insulator transition in NdNiO3 films by site-selective X-ray absorption spectroscopycitations
- 2013Cationic vacancies and anomalous spectral-weight transfer in Ti1-xTaxO2 thin films studied via polarization-dependent near-edge x-ray absorption fine structure spectroscopycitations
Places of action
| Organizations | Location | People |
|---|
article
Investigation of the metal-insulator transition in NdNiO3 films by site-selective X-ray absorption spectroscopy
Abstract
In this work, multifunctional oxide NdNiO<sub>3</sub> (NNO) thin films grown on a SrTiO<sub>3</sub> (STO) substrate using pulsed-laser deposition are studied. Temperature dependent resistivity measurements revealed that NNO/STO samples exhibit a sharp thickness dependent metal-insulator transition (MIT) over a range of 150-200 K. It is known that the electronic properties of correlated oxides are extremely complex and sensitive to changes in orbital occupancy. To evaluate the changes in the electronic and/or crystallographic structure responsible for the MIT, a site-selective (O, Ni and Nd) X-ray absorption near edge structure (XANES) analysis is performed above and below the transition temperature. Analysis of XANES spectra suggests that: (i) in NNO films nominally trivalent Ni ions exhibit multiple valency (bond disproportionation), (ii) intermetallic hybridization plays an important role, (iii) the presence of strong O 2p-O 2p hole correlation at low temperature results in the opening of the p-p gap and (iv) the valency of Nd ions matches well with that of Nd<sup>3+</sup>. For NNO films exhibiting a sharp MIT, Ni 3d electron localization and concurrent existence of Ni 3d<sup>8</sup> and Ni 3d<sup>8</sup>L<sup>2</sup> states are responsible for the observed transition. At temperatures below the MIT the O 2p-O 2p hole correlation is strong enough to split the O 2p band stabilizing insulating phase. Temperature and thickness dependent differences observed in the site-selective XANES data are discussed in terms of possible mechanisms for the MIT (negative charge-transfer type). © The Royal Society of Chemistry 2017.