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Ground state and the metal-insulator transition in (Pr1−y Y y )1−x Ca x CoO3 (0.45 ≤ x ≤ 0.55) cobaltites

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Abstract

Pr0.5Ca0.5CoO3 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−x Ca x CoO3cobaltites with Ca do** 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-do** 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].

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Authors and Affiliations

  1. Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus Univ. deBellaterra, E-08193, Bellaterra, Spain

    A. J. Barón-González, J. L. García-Muñoz, J. Herrero-Martín & C. Frontera

  2. Instituto de Ciencias de Materiales de Aragón, CSIC-Universidad de Zaragoza, c/ Pedro Cerbuna 12, 50009, Zaragoza, Spain

    G. Subías & J. Blasco

Authors
  1. A. J. Barón-González
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  2. J. L. García-Muñoz
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  3. J. Herrero-Martín
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  4. C. Frontera
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  5. G. Subías
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  6. J. Blasco
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Correspondence to J. Herrero-Martín.

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Barón-González, A.J., García-Muñoz, J.L., Herrero-Martín, J. et al. Ground state and the metal-insulator transition in (Pr1−y Y y )1−x Ca x CoO3 (0.45 ≤ x ≤ 0.55) cobaltites. Journal of the Korean Physical Society 63, 791–794 (2013). https://doi.org/10.3938/jkps.63.791

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