Distinct Evidence of Orbital Order in Spinel Oxide FeV2O4 by 57Fe Mössbauer Spectroscopy

Shin Nakamura, Akio Fuwa

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    An 57Fe Mössbauer spectroscopy has been conducted on the spinel oxide FeV2O4, where both Fe2+ and V3+ ions bear spin and orbital degrees of freedom. Distinct evidence of the orbital order in FeV2O4 was found. That is, at 65 K, where the transition from the orthorhombic phase to the lowerature tetragonal phase takes place, the sign of the quadrupole coupling constant e2qQ/2 changes abruptly from negative to positive. The change in the orbital state accompanies a sudden decrease in the hyperfine field Hhf. The small Hhf implies the presence of the orbital angular momentum L, whose value itself does not change considerably through the transition. The spin order in the Fe2+ ion was also obtained. In the ferrimagnetic state below 110 K, the Fe2+ spin aligns along the orthorhombic a-axis (the longest axis). In the canted ferrimagnetic state below 65 K, however, the Fe2+ spin seems to incline slightly from the tetragonal c-axis. The canted V3+ spin may cause the slight canting of the Fe2+ spin.

    Original languageEnglish
    Article number014702
    JournalJournal of the Physical Society of Japan
    Volume85
    Issue number1
    DOIs
    Publication statusPublished - 2016 Jan 15

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    spinel
    orbitals
    oxides
    spectroscopy
    bears
    ions
    angular momentum
    degrees of freedom
    quadrupoles
    causes

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Distinct Evidence of Orbital Order in Spinel Oxide FeV2O4 by 57Fe Mössbauer Spectroscopy. / Nakamura, Shin; Fuwa, Akio.

    In: Journal of the Physical Society of Japan, Vol. 85, No. 1, 014702, 15.01.2016.

    Research output: Contribution to journalArticle

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    abstract = "An 57Fe M{\"o}ssbauer spectroscopy has been conducted on the spinel oxide FeV2O4, where both Fe2+ and V3+ ions bear spin and orbital degrees of freedom. Distinct evidence of the orbital order in FeV2O4 was found. That is, at 65 K, where the transition from the orthorhombic phase to the lowerature tetragonal phase takes place, the sign of the quadrupole coupling constant e2qQ/2 changes abruptly from negative to positive. The change in the orbital state accompanies a sudden decrease in the hyperfine field Hhf. The small Hhf implies the presence of the orbital angular momentum L, whose value itself does not change considerably through the transition. The spin order in the Fe2+ ion was also obtained. In the ferrimagnetic state below 110 K, the Fe2+ spin aligns along the orthorhombic a-axis (the longest axis). In the canted ferrimagnetic state below 65 K, however, the Fe2+ spin seems to incline slightly from the tetragonal c-axis. The canted V3+ spin may cause the slight canting of the Fe2+ spin.",
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    N2 - An 57Fe Mössbauer spectroscopy has been conducted on the spinel oxide FeV2O4, where both Fe2+ and V3+ ions bear spin and orbital degrees of freedom. Distinct evidence of the orbital order in FeV2O4 was found. That is, at 65 K, where the transition from the orthorhombic phase to the lowerature tetragonal phase takes place, the sign of the quadrupole coupling constant e2qQ/2 changes abruptly from negative to positive. The change in the orbital state accompanies a sudden decrease in the hyperfine field Hhf. The small Hhf implies the presence of the orbital angular momentum L, whose value itself does not change considerably through the transition. The spin order in the Fe2+ ion was also obtained. In the ferrimagnetic state below 110 K, the Fe2+ spin aligns along the orthorhombic a-axis (the longest axis). In the canted ferrimagnetic state below 65 K, however, the Fe2+ spin seems to incline slightly from the tetragonal c-axis. The canted V3+ spin may cause the slight canting of the Fe2+ spin.

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