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We have measured the photoemission spectra of Nd$_{1-x}$Sm$_{x}$NiO$_{3}$,where the metal-insulator transition and the N\'{e}el ordering occur at thesame temperature for $x \lesssim 0.4$ and the metal-insulator transitiontemperature ($T_{MI}$) is higher than the N\'{e}el temperature for $x \gtrsim0.4$. For $x \le 0.4$, the spectral intensity at the Fermi level is high in themetallic phase above $T_{MI}$ and gradually decreases with cooling in theinsulating phase below $T_{MI}$ while for $x > 0.4$ it shows a pseudogap-likebehavior above $T_{MI}$ and further diminishes below $T_{MI}$. The resultsclearly establish that there is a sharp change in the nature of the electroniccorrelations in the middle ($x \sim 0.4$) of the metallic phase of the$R$NiO$_3$ system.Comment: 4 pages, 4 figure, submitted to Phys. Rev.

physical review. b, condensed matter

Crossover in the nature of the metallic phases in the perovskite-type<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Crossover in the nature of the metallic phases in the perovskite-typeRNiO3