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Ground State and the Metal-insulator Transition in (Pr1−yYy)1−xCaxCoO3 (0.45 ≤ x ≤ 0.55) Cobaltites
A. J. Bar´on-Gonz´alez,J. L. Garc´ıa-Mu˜noz,J. Herrero-Mart´ın,C. Frontera,G. Sub´ıas,J. Blasco 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Pr0.5Ca0.5CoO3 exhibits a non-conventional metal-insulator transition (MIT) in which the insulatingstate is due toa volume contraction (2%) and electron transfer from Pr to Co sites. Pr1−xCaxCoO3cobaltites with Ca doping around x 0.5 (0.45 ≤ x ≤ 0.55) have been investigated. Different ground states and phase transitions are reported in samples at both sides of the half-dopedcomposition. The relevance of the Pr/Ca ratio around half-doping and the amplitude of the changesobserved at the MIT are analyzed. Besides the expected variation in the transition temperature, wereport an enhanced Pr3+/Pr4+ transformation at the MIT in Pr0.45Y0.05Ca0.50CoO3[0.25(5) e−/Pr ion and TMI = 120 K] with respect to Pr0.5Ca0.5CoO3[0.15(5) e−/ Pr ion and TMI = 75 K].