Speaker
Flavio Bruno
(University of Geneva)
Description
Taking advantage of the large electron escape depth of soft x-ray angle resolved photoemission spectroscopy we report measurements of the electronic structure of (111)-oriented [LaNiO3/LaMnO3] superlattices and LaNiO3 epitaxial thin films. For thin films we observe a 3D Fermi surface with an electron pocket at the Brillouin zone center and hole pockets at the zone vertices. Superlattices with thick nickelate layers present a similar electronic structure. However, as the thickness of the LaNiO3 is reduced to 7 monolayers the superlattices become insulating. These heterostructures do not show a marked redistribution of spectral weight in momentum space but exhibit a pseudogap of ≈ 50 meV. [APL Materials 5, 016101 (2017)]
Primary author
Flavio Bruno
(University of Geneva)
Co-authors
Dr
Marta Gibert
(Université de Genève)
Dr
S. McKeown Walker
(University of Geneva)
Dr
Oleg Peil
(Université de Genève)
Dr
A. de la Torre
(University of Geneva)
Sara Ricco
(University of Geneva)
Dr
Z. Wang
( Paul Scherrer Institute)
Dr
Sara Catalano
(Université de Genève)
Dr
A. Tamai
(University of Geneva)
Dr
F. Bisti
( Paul Scherrer Institute)
Dr
V. Strocov
( Paul Scherrer Institute)
Prof.
Jean-Marc Triscone
(Université de Genève)
Prof.
F. Baumberger
(University of Geneva)
