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We present a study of the structure, the electric resistivity, the magneticsusceptibility, and the thermal expansion of La$_{1-x}$Eu$_x$CoO$_3$. LaCoO$_3$shows a temperature-induced spin-state transition around 100 K and ametal-insulator transition around 500 K. Partial substitution of La$^{3+}$ bythe smaller Eu$^{3+}$ causes chemical pressure and leads to a drastic increaseof the spin gap from about 190 K in LaCoO$_3$ to about 2000 K in EuCoO$_3$, sothat the spin-state transition is shifted to much higher temperatures. Acombined analysis of thermal expansion and susceptibility gives evidence thatthe spin-state transition has to be attributed to a population of anintermediate-spin state with orbital order for $x<0.5$ and without orbitalorder for larger $x$. In contrast to the spin-state transition, themetal-insulator transition is shifted only moderately to higher temperatureswith increasing Eu content, showing that the metal-insulator transition occursindependently from the spin-state distribution of the Co$^{3+}$ ions. Aroundthe metal-insulator transition the magnetic susceptibility shows a similarincrease for all $x$ and approaches a doping-independent value around 1000 Kindicating that well above the metal-insulator transition the same spin stateis approached for all $x$.Comment: 10 pages, 6 figure

physical review. b, condensed matter and materials physics

Spin-state transition and metal-insulator transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Eu</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant="normal">Co</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Spin-state transition and metal-insulator transition inLa1−xEuxCoO3