VUV Pump and Probe of Phase Separation and Oxygen Interstitials in La2NiO4+y Using Spectromicroscopy
AbstractWhile it is known that strongly correlated transition metal oxides described by a multi-band Hubbard model show microscopic multiscale phase separation, little is known about the possibility to manipulate them with vacuum ultraviolet (VUV), 27 eV lighting. We have investigated the photo-induced effects of VUV light illumination of a super-oxygenated La2NiO4+y single crystal by means of scanning photoelectron microscopy. VUV light exposure induces the increase of the density of states (DOS) in the binding energy range around Eb = 1.4 eV below EF. The photo-induced states in this energy region have been predicted due to clustering of oxygen interstitials by band structure calculations for large supercell of La2CuO4.125. We finally show that it is possible to generate and manipulate oxygen rich domains by VUV illumination as it was reported for X-ray illumination of La2CuO4+y. This phenomenology is assigned to oxygen-interstitials ordering and clustering by photo-illumination forming segregated domains in the La2NiO4+y surface. View Full-Text
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Bianconi, A.; Marcelli, A.; Bendele, M.; Innocenti, D.; Barinov, A.; Poirot, N.; Campi, G. VUV Pump and Probe of Phase Separation and Oxygen Interstitials in La2NiO4+y Using Spectromicroscopy. Condens. Matter 2018, 3, 6.
Bianconi A, Marcelli A, Bendele M, Innocenti D, Barinov A, Poirot N, Campi G. VUV Pump and Probe of Phase Separation and Oxygen Interstitials in La2NiO4+y Using Spectromicroscopy. Condensed Matter. 2018; 3(1):6.Chicago/Turabian Style
Bianconi, Antonio; Marcelli, Augusto; Bendele, Markus; Innocenti, Davide; Barinov, Alexei; Poirot, Nathalie; Campi, Gaetano. 2018. "VUV Pump and Probe of Phase Separation and Oxygen Interstitials in La2NiO4+y Using Spectromicroscopy." Condens. Matter 3, no. 1: 6.
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