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Correlation of conductivity and angle integrated valence band photoemission characteristics in single crystal iron perovskites for 300 K < T < 800 K: Comparison of surface and bulk sensitive methods |
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| Authors: | A Braun BS Mun Y Sun O Gröning S Erat X Zhang SS Mao E Pomjakushina T Graule |
| Institution: | a Department of Modern Materials and Surfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Zürich, Switzerland b Advanced Light Source, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA c Department of Physics, Hanyang University, Ansan, Republic of Korea d Stanford Synchrotron Radiation Lightsource, Menlo Park, CA 94025, USA e Department for Nonmetallic Inorganic Materials, ETH Zürich, Swiss Federal Institute of Technology, CH-8037 Zürich, Switzerland f Department of Mechanical Engineering, University of California, Berkeley, Berkeley, CA 94720, USA g Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA h Laboratory for Developments and Methods, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland i Technische Universität Bergakademie Freiberg, D-09596 Freiberg, Germany |
| Abstract: | A single crystal monolith of La0.9Sr0.1FeO3 and thin pulsed laser deposited film of La0.8Sr0.2Fe0.8Ni0.2O3 were subject to angle integrated valence band photoemission spectroscopy in ultra high vacuum and conductivity experiments in ambient air at temperatures from 300 K to 800 K. Except for several sputtering and annealing cycles, the specimens were not prepared in situ. Peculiar changes in the temperature dependent, bulk representative conductivity profile as a result of reversible phase transitions, and irreversible chemical changes are semi-quantitatively reflected by the intensity variation in the more surface representative valence band spectra near the Fermi energy. X-ray photoelectron diffraction images reflect the symmetry as expected from bulk iron perovskites. The correlation of spectral details in the valence band photoemission spectra (VB PES) and details of the conductivity during temperature variation suggest that valuable information on electronic structure and transport properties of complex materials may be obtained without in situ preparation. |
| Keywords: | Perovskite Metal-insulator transition Cathode material Conductivity High temperature Photoemission spectroscopy Valence band |
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