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Condens. Matter 2018, 3(1), 6; https://doi.org/10.3390/condmat3010006

VUV Pump and Probe of Phase Separation and Oxygen Interstitials in La2NiO4+y Using Spectromicroscopy

1
Rome International Center of Materials Science Superstripes, RICMASS, Via dei Sabelli 119A, 00185 Rome, Italy
2
Institute of Crystallography, Consiglio Nazional delle Ricerche, IC-CNR, Via Salaria Km 29.300, Monterotondo, I-00015 Rome, Italy
3
National Research Nuclear University, MEPhI (Moscow Engineering Physics Institute), Kashirskoye sh. 31, 115409 Moscow, Russia
4
Latvia Academy of Science, Akadēmijas laukums 1, LV-1050 Riga, Latvia
5
Laboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, 00044 Frascati, Italy
6
Department of Chemistry, University of Liverpool, Liverpool L69 7ZD, UK
7
Sincrotrone Trieste S.C.p.A., Area Science Park, 34012 Basovizza, Italy
8
Institut Universitaire de Technologie de Blois (IUT Blois), Université de Tours, 15, Rue de la Chocolaterie, 41029 Blois, France
*
Authors to whom correspondence should be addressed.
Received: 17 January 2018 / Revised: 8 February 2018 / Accepted: 9 February 2018 / Published: 11 February 2018
(This article belongs to the Special Issue New Trends in Quantum Complex Matter)
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Abstract

While 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
Keywords: defects in multi-band Hubbard model; photo-induced effects; oxygen interstitials; phase separation; quasi stationary states out of equilibrium; metastable phases; defects self-organization defects in multi-band Hubbard model; photo-induced effects; oxygen interstitials; phase separation; quasi stationary states out of equilibrium; metastable phases; defects self-organization
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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.

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