Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-06-06
Applied Physics Letters 95, 022107 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1063/1.3174916
Reversible and irreversible discontinuities at around 573 K and 823 K in the electric conductivity of a strained 175 nm thin film of (La0.8Sr0.2)0.95Ni0.2Fe0.8O3-{\delta} grown by pulsed laser deposition on SrTiO3 (110) are reflected by valence band changes as monitored in photoemission and oxygen K-edge x-ray absorption spectra. The irreversible jump at 823 K is attributed to depletion of doped electron holes and reduction of Fe4+ to Fe3+, as evidenced by oxygen and iron core level soft x-ray spectroscopy, and possibly of a chemical origin, whereas the reversible jump at 573 K possibly originates from structural changes.
Ari M.
Braun Alexander
Erat Selma
Graule Thomas
Grimmer H.
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