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Ground state and the metal-insulator transition in (Pr1-yYy)1-xCaxCoO3 (0.45 ≤ x ≤ 0.55) cobaltites

AuthorsBarón González, Aura J. CSIC ORCID; García Muñoz, Josep Lluís; Herrero Martín, Javier CSIC ORCID; Frontera, Carlos CSIC ORCID; Subías, G. CSIC ORCID; Blasco, Javier CSIC ORCID
Issue Date2013
CitationJournal of the Korean Physical Society 63(3): 791-794 (2013)
AbstractPr0.5Ca0.5CoO3 exhibits a non-conventional metal-insulator transition (MIT) in which the insulating state 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-doped composition. The relevance of the Pr/Ca ratio around half-doping and the amplitude of the changes observed at the MIT are analyzed. Besides the expected variation in the transition temperature, we report an enhanced Pr3+/Pr4+ transformation at the MIT in Pr0.45Y0.05Ca0.50CoO3[0.25(5) e-/Pr ion and T MI = 120 K] with respect to Pr0.5Ca0.5CoO3[0.15(5) e-/ Pr ion and T MI = 75 K]. © 2013 The Korean Physical Society.
Publisher version (URL)http://dx.doi.org/10.3938/jkps.63.791
Identifiersdoi: 10.3938/jkps.63.791
issn: 0374-4884
e-issn: 1976-8524
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