TY - JOUR
T1 - Crossover in the nature of the metallic phases in the perovskite-type RNiO3
AU - Okazaki, K.
AU - Mizokawa, T.
AU - Fujimori, A.
AU - Sampathkumaran, E. V.
AU - Martinez-Lope, M. J.
AU - Alonso, J. A.
PY - 2003/2/15
Y1 - 2003/2/15
N2 - We have measured the photoemission spectra of Nd1-xSmxNiO3, where the metal-insulator transition and the Néel ordering occur at the same temperature for x≲0.4 and the metal-insulator transition temperature (TMI) is higher than the Néel temperature for x≳0.4. For x≤0.4, the spectral intensity at the Fermi level is high in the metallic phase above TMI and gradually decreases with cooling in the insulating phase below TMI while for x>0.4 it shows a pseudogaplike behavior above TMI and further diminishes below TMI. The results clearly establish that there is a change in the nature of the electronic correlations in the middle (x∼0.4) of the metallic phase of the RNiO3 system.
AB - We have measured the photoemission spectra of Nd1-xSmxNiO3, where the metal-insulator transition and the Néel ordering occur at the same temperature for x≲0.4 and the metal-insulator transition temperature (TMI) is higher than the Néel temperature for x≳0.4. For x≤0.4, the spectral intensity at the Fermi level is high in the metallic phase above TMI and gradually decreases with cooling in the insulating phase below TMI while for x>0.4 it shows a pseudogaplike behavior above TMI and further diminishes below TMI. The results clearly establish that there is a change in the nature of the electronic correlations in the middle (x∼0.4) of the metallic phase of the RNiO3 system.
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M3 - Article
AN - SCOPUS:0037441273
VL - 67
SP - 731011
EP - 731014
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 7
M1 - 073101
ER -