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Metal-insulator transition and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mtext>Pr</mml:mtext></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mo>/</mml:mo><mml:msup><mml:mrow><mml:mtext>Pr</mml:mtext></mml:mrow><mml:mrow><mml:mn>4</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>valence shift in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><…
The magnetic, electric, and thermal properties of the ${(L{n}_{1\ensuremath{-}y}{\text{Y}}_{y})}_{0.7}{\text{Ca}}_{0.3}{\text{CoO}}_{3}$ perovskites $(Ln=\text{Pr},\text{Nd})$ were investigated down to very low temperatures. The main attention was given to a peculiar metal-insulator (M-I) transition, which is observed in the praseodymium based samples with $y=0.075$ and 0.15 at ${T}_{\text{M-I}}=64\text{ }\text{K}$ and 132 K, respectively. The study …