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    Raman-scattering study of R2CuO4 (R=Pr, Nd, Sm, and Gd)

    Masayuki Udagawa, Yoshinori Nagaoka, and Norio Ogita

    Miki Masada and Jun Akimitsu

    Kohji Ohbayashi

    • Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 724, Japan

    • College of Science and Engineering, Aoyama Gakuin University, Tokyo 157, Japan

    • Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 724, Japan

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    Phys. Rev. B 49, 585 – Published 1 January, 1994

    DOI: https://doi.org/10.1103/PhysRevB.49.585

    Abstract

    For Gd2CuO4, a symmetry-forbidden phonon for the tetragonal T’ structure is observed. This shows that oxygen in the CuO2 plane is locally distorted along the plane. Such distortion has not been observed for other T’-type superconductors. The normal-mode calculation shows that the correlation between the CuO2 plane and R-O layers increases with decreasing ionic radius. The increased three-dimensional character and the appearance of the distortion of O in the CuO2 plane along the a axis are useful experimental results that help clarify the mechanism that causes the disappearance of superconductivity for Gd.

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    Phys. Rev. B 49, 585– Published 1 January, 1994
    • Received 21 September 1993

    © 1994 American Physical Society

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