Crystallographic features of the charge-orbital-ordered state in the highly-correlated electronic system Ca1-xPrxMnO3

Kentaro Kojima, Yasuhide Inoue, Masazumi Arao, Yasumasa Koyama

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The charge-exchange-type orbital-ordered (CEOO) state accompanying antiferromagnetic ordering has been reported in the highly-correlated electronic system Ca1-xPrxMnO3 (CPMO) with the simple perovskite structure. The feature of the CEOO state in CPMO is that the state is present in the wide Pr-content range of 0.30 ≤ x ≤ 0.70. Although the Zener-polaron model was proposed for the CEOO state at x = 0.60, the detailed features of the CEOO state, particularly for lower Pr contents, have not been understood sufficiently. We have thus investigated the crystallographic features of the CEOO state in CPMO with 0.40 ≤ x ≤ 0.50, mainly by transmission electron microscopy. It was found that, when the temperature was lowered from the disordered state, incommensurate satellite reflections characterizing the CEOO state appeared in electron diffraction patterns below about 250 K in CPMO. The careful analysis of the reflections indicated that the CEOO state for 0.40 ≤ x ≤ 0.45 was different from that for 0.45 ≤ x ≤ 0.50. Concretely, the former CEOO state accompanied only a transverse lattice modulation, while both transverse and longitudinal modulations with different wave vectors appeared in the latter state. This implies that the state for 0.40 ≤ x ≤ 0.45 can be regarded as an orbital-modulated (OM) state without a charge modulation. It is thus understood that an increase in the Pr content leads to the OM-to-CEOO state change below about 250 K around x = 0.45.

    Original languageEnglish
    Title of host publicationAdvanced Materials Research
    PublisherTrans Tech Publications
    Pages376-382
    Number of pages7
    Volume922
    ISBN (Print)9783038350743
    DOIs
    Publication statusPublished - 2014
    Event8th International Conference on Processing and Manufacturing of Advanced Materials: Processing, Fabrication, Properties, Applications, THERMEC 2013 - Las Vegas, NV
    Duration: 2013 Dec 22013 Dec 6

    Publication series

    NameAdvanced Materials Research
    Volume922
    ISSN (Print)10226680

    Other

    Other8th International Conference on Processing and Manufacturing of Advanced Materials: Processing, Fabrication, Properties, Applications, THERMEC 2013
    CityLas Vegas, NV
    Period13/12/213/12/6

    Fingerprint

    Modulation
    Electron diffraction
    Perovskite
    Diffraction patterns
    Satellites
    Transmission electron microscopy
    Temperature

    Keywords

    • Charge-exchange-type orbital-ordered state
    • Highly-correlated electronic system
    • Orbital modulated state
    • Simple perovskite manganite
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Kojima, K., Inoue, Y., Arao, M., & Koyama, Y. (2014). Crystallographic features of the charge-orbital-ordered state in the highly-correlated electronic system Ca1-xPrxMnO3 In Advanced Materials Research (Vol. 922, pp. 376-382). (Advanced Materials Research; Vol. 922). Trans Tech Publications. https://doi.org/10.4028/www.scientific.net/AMR.922.376

    Crystallographic features of the charge-orbital-ordered state in the highly-correlated electronic system Ca1-xPrxMnO3 . / Kojima, Kentaro; Inoue, Yasuhide; Arao, Masazumi; Koyama, Yasumasa.

    Advanced Materials Research. Vol. 922 Trans Tech Publications, 2014. p. 376-382 (Advanced Materials Research; Vol. 922).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Kojima, K, Inoue, Y, Arao, M & Koyama, Y 2014, Crystallographic features of the charge-orbital-ordered state in the highly-correlated electronic system Ca1-xPrxMnO3 in Advanced Materials Research. vol. 922, Advanced Materials Research, vol. 922, Trans Tech Publications, pp. 376-382, 8th International Conference on Processing and Manufacturing of Advanced Materials: Processing, Fabrication, Properties, Applications, THERMEC 2013, Las Vegas, NV, 13/12/2. https://doi.org/10.4028/www.scientific.net/AMR.922.376
    Kojima K, Inoue Y, Arao M, Koyama Y. Crystallographic features of the charge-orbital-ordered state in the highly-correlated electronic system Ca1-xPrxMnO3 In Advanced Materials Research. Vol. 922. Trans Tech Publications. 2014. p. 376-382. (Advanced Materials Research). https://doi.org/10.4028/www.scientific.net/AMR.922.376
    Kojima, Kentaro ; Inoue, Yasuhide ; Arao, Masazumi ; Koyama, Yasumasa. / Crystallographic features of the charge-orbital-ordered state in the highly-correlated electronic system Ca1-xPrxMnO3 Advanced Materials Research. Vol. 922 Trans Tech Publications, 2014. pp. 376-382 (Advanced Materials Research).
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    abstract = "The charge-exchange-type orbital-ordered (CEOO) state accompanying antiferromagnetic ordering has been reported in the highly-correlated electronic system Ca1-xPrxMnO3 (CPMO) with the simple perovskite structure. The feature of the CEOO state in CPMO is that the state is present in the wide Pr-content range of 0.30 ≤ x ≤ 0.70. Although the Zener-polaron model was proposed for the CEOO state at x = 0.60, the detailed features of the CEOO state, particularly for lower Pr contents, have not been understood sufficiently. We have thus investigated the crystallographic features of the CEOO state in CPMO with 0.40 ≤ x ≤ 0.50, mainly by transmission electron microscopy. It was found that, when the temperature was lowered from the disordered state, incommensurate satellite reflections characterizing the CEOO state appeared in electron diffraction patterns below about 250 K in CPMO. The careful analysis of the reflections indicated that the CEOO state for 0.40 ≤ x ≤ 0.45 was different from that for 0.45 ≤ x ≤ 0.50. Concretely, the former CEOO state accompanied only a transverse lattice modulation, while both transverse and longitudinal modulations with different wave vectors appeared in the latter state. This implies that the state for 0.40 ≤ x ≤ 0.45 can be regarded as an orbital-modulated (OM) state without a charge modulation. It is thus understood that an increase in the Pr content leads to the OM-to-CEOO state change below about 250 K around x = 0.45.",
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