TY - JOUR
T1 - Temperature-dependent electronic structure of Nd1-xSmxNiO3
AU - Okazaki, K.
AU - Mizokawa, T.
AU - Fujimori, A.
AU - Sampathkumaran, E. V.
AU - Alonso, J. A.
N1 - Funding Information:
The authors would like to thank D.D. Sarma for useful discussion. This work was supported by a Grant-in-Aid for Scientific Research from Ministry of Education, Culture, Sports, Science, and Technology (MEXT).
PY - 2002
Y1 - 2002
N2 - RNiO3 (R: rare earth) is one of the typical bandwidth-control metal-insulator transition systems. Its metal-insulator transition temperature (TMI) is the same as the antiferromagnetic transition temperature (TN) for R = Pr and Nd, while TMI is higher than TN for R = Sm and Eu. The boundary between the two types of phase transitions is located between NdNiO3 and SmNiO3. We have measured photoemission spectra of Nd1-xSmxNiO3 at various temperatures above and below TMI. The spectra show quite different temperature dependences between x ≤ 0.4 and x ≥ 0.6. For x ≤ 0.4, the spectral intensity near the Fermi level (EF) is temperature-dependent even well below TMI, while for x ≥ 0.6 it shows a significant temperature dependence only near TMI. Also, the spectra near EF above TMI show a pseudo-gap like behavior for x ≥ 0.6. From these results, we conclude that the metallic phase has different natures between x ≤ 0.4 and x ≥ 0.6.
AB - RNiO3 (R: rare earth) is one of the typical bandwidth-control metal-insulator transition systems. Its metal-insulator transition temperature (TMI) is the same as the antiferromagnetic transition temperature (TN) for R = Pr and Nd, while TMI is higher than TN for R = Sm and Eu. The boundary between the two types of phase transitions is located between NdNiO3 and SmNiO3. We have measured photoemission spectra of Nd1-xSmxNiO3 at various temperatures above and below TMI. The spectra show quite different temperature dependences between x ≤ 0.4 and x ≥ 0.6. For x ≤ 0.4, the spectral intensity near the Fermi level (EF) is temperature-dependent even well below TMI, while for x ≥ 0.6 it shows a significant temperature dependence only near TMI. Also, the spectra near EF above TMI show a pseudo-gap like behavior for x ≥ 0.6. From these results, we conclude that the metallic phase has different natures between x ≤ 0.4 and x ≥ 0.6.
KW - A. Oxides
KW - C. Photoelectron spectroscopy
KW - D. Electronic structure
KW - D. Phase transitions
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U2 - 10.1016/S0022-3697(02)00031-8
DO - 10.1016/S0022-3697(02)00031-8
M3 - Article
AN - SCOPUS:0036601675
VL - 63
SP - 975
EP - 978
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 6-8
ER -