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2 results on '"quasi stationary states out of equilibrium"'

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

Author

Antonio Bianconi, Augusto Marcelli, Markus Bendele, Davide Innocenti, Alexei Barinov, Nathalie Poirot, and Gaetano Campi

Subjects
defects in multi-band Hubbard model, photo-induced effects, oxygen interstitials, phase separation, quasi stationary states out of equilibrium, metastable phases, defects self-organization, Physics, QC1-999
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.

Published
2018
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2. VUV Pump and Probe of Phase Separation and Oxygen Interstitials in La2NiO4+y Using Spectromicroscopy

Author

Nathalie Poirot, Davide Innocenti, Alexei Barinov, Antonio Bianconi, Markus Bendele, Augusto Marcelli, Gaetano Campi, Rome Int Ctr Mat Sci Superstripes RICMASS, I-00185 Rome, Italy, The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], University of Latvia (LU), CNR, Inst Crystallog, I-00015 Monterotondo Roma, Italy, Laboratori Nazionali di Frascati (LNF), Istituto Nazionale di Fisica Nucleare (INFN), INFN Frascati, Department of Chemistry University of Liverpool, University of Liverpool, Sincrotrone Trieste SCpA (SINCROTRONE TRIESTE), Sincrotrone Trieste SCpA, GREMAN (matériaux, microélectronique, acoustique et nanotechnologies) (GREMAN - UMR 7347), Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Université de Tours-Institut National des Sciences Appliquées - Centre Val de Loire (INSA CVL), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Hubbard model, Binding energy, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, Molecular physics, Condensed Matter - Strongly Correlated Electrons, Transition metal, 0103 physical sciences, photo-induced effects, defects in multi-band Hubbard model, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], 010306 general physics, Electronic band structure, [PHYS]Physics [physics], Range (particle radiation), Strongly Correlated Electrons (cond-mat.str-el), metastable phases, oxygen interstitials, phase separation, quasi stationary states out of equilibrium, defects self-organization, 021001 nanoscience & nanotechnology, Condensed Matter Physics, lcsh:QC1-999, 3. Good health, Electronic, Optical and Magnetic Materials, Density of states, Supercell (crystal), [PHYS.COND.CM-SCE]Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el], 0210 nano-technology, Single crystal, lcsh:Physics
Abstract

While it is known that strongly correlated transition metal oxides described by multi-band Hubbard model show microscopic multiscale phase separation little is known on the possibility to manipulate them with vacuum ultraviolet (VUV) 27 eV lighting. We have investigated the photo-induced effects of VUV 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 as due to clustering of oxygen interstitials by band structure calculations for large supercell of La2CuO4.125. We finally show that it 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, Comment: 10 pages, 3 figures

Published
2018
Full Text
View/download PDF

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