Optical properties of BaMnF4

Toru Asahi, M. Tomizawa, J. Kobayashi, W. Kleemann

    研究成果: Article

    16 引用 (Scopus)

    抄録

    Optical properties of pyroelectric and antiferromagnetic BaMnF4 were studied by using a high-accuracy universal polarimeter in the temperature range including the incommensurate phase transition point Ti. Both phases above and below Ti were found to be optically active. The active gyration tensor components gij were consistent with the reported symmetry of the crystal, i.e., C2v and C2 above and below Ti. Temperature dependences of all the gyration components were measured. It is striking that g23, which exists commonly in both phases, manifested itself a sharp peak at Ti. This divergence of g23 makes the transition perfectly second order. g11 along the incommensurate a axis develops conspicuously. The present results of the birefringences did not perfectly agree with previous reports: Although the temperature dependence of nc coincided with the result of Schäfer et al., those of na and nb were quite different in their report. Rotation of the indicatrix takes place only around the a axis of the low-temperature phase. This fact confirms the validity of the point group C2 of the low-temperature phase. The rotation angle of the indicatrix was found to be one order of magnitude larger than that of the crystallographic axes. The rotation angle of the gyration surface was also evaluated. It is approximately two orders of magnitude larger than the rotation angle of the indicatrix. This fact clearly indicates that gyrations are very sensitively affected by the change of the order parameter.

    元の言語English
    ページ(範囲)1971-1987
    ページ数17
    ジャーナルPhysical Review B
    45
    発行部数5
    DOI
    出版物ステータスPublished - 1992

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    gyration
    Optical properties
    optical properties
    Temperature
    temperature dependence
    Point groups
    polarimeters
    transition points
    Polarimeters
    birefringence
    Crystal symmetry
    divergence
    Birefringence
    Tensors
    tensors
    Phase transitions
    symmetry
    Crystals
    crystals
    temperature

    ASJC Scopus subject areas

    • Condensed Matter Physics

    これを引用

    Asahi, T., Tomizawa, M., Kobayashi, J., & Kleemann, W. (1992). Optical properties of BaMnF4. Physical Review B, 45(5), 1971-1987. https://doi.org/10.1103/PhysRevB.45.1971

    Optical properties of BaMnF4. / Asahi, Toru; Tomizawa, M.; Kobayashi, J.; Kleemann, W.

    :: Physical Review B, 巻 45, 番号 5, 1992, p. 1971-1987.

    研究成果: Article

    Asahi, T, Tomizawa, M, Kobayashi, J & Kleemann, W 1992, 'Optical properties of BaMnF4', Physical Review B, 巻. 45, 番号 5, pp. 1971-1987. https://doi.org/10.1103/PhysRevB.45.1971
    Asahi T, Tomizawa M, Kobayashi J, Kleemann W. Optical properties of BaMnF4. Physical Review B. 1992;45(5):1971-1987. https://doi.org/10.1103/PhysRevB.45.1971
    Asahi, Toru ; Tomizawa, M. ; Kobayashi, J. ; Kleemann, W. / Optical properties of BaMnF4. :: Physical Review B. 1992 ; 巻 45, 番号 5. pp. 1971-1987.
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