Effect of Partial Oxygen Isotope Substitution on the Phase Diagram of (Pr1-yEuy)0.7Ca0.3CoO3 Cobaltites

N.A. Babushkina; A.N. Taldenkov; A.V. Kalinov; T.G. Kuzmova; A.A. Kamenev; A.R. Kaul

doi:10.4028/www.scientific.net/SSP.190.667

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Effect of Partial Oxygen Isotope Substitution on the Phase Diagram of (Pr_1-yEu_y)_0.7Ca_0.3CoO₃ Cobaltites

Abstract:

Effect of the partial oxygen isotope substitution on (Pr_1-yEu_y)_0.7Ca_0.3CoO₃ cobaltites was studied in detail for the crossover region (0.12<у<0.26) of the phase diagram. We prepared a series of the cobaltite samples with the different degrees of enrichment by the heavy oxygen isotope ¹⁸O, namely, containing 90%, 67%, 43%, 17%, and 0% of ¹⁸O. The Eu doping of the samples was chosen to be near and on the both sides of the crossover doping level y_cr. Based on measurements of the ac magnetic susceptibility χ(Т) and electrical resistivity ρ(Т), we were able to analyze the evolution the sample properties with the change Eu and ¹⁸O content.