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

Masayuki Udagawa; Yoshinori Nagaoka; Norio Ogita; Miki Masada; Jun Akimitsu; Kohji Ohbayashi

doi:10.1103/PhysRevB.49.585

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

Masayuki Udagawa, Yoshinori Nagaoka, Norio Ogita, Miki Masada, Jun Akimitsu, Kohji Ohbayashi

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

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.

Original language	English
Pages (from-to)	585-588
Number of pages	4
Journal	Physical Review B
Volume	49
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.49.585
Publication status	Published - 1994
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics

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10.1103/PhysRevB.49.585

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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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AU - Udagawa, Masayuki

AU - Nagaoka, Yoshinori

AU - Ogita, Norio

AU - Masada, Miki

AU - Akimitsu, Jun

AU - Ohbayashi, Kohji

PY - 1994

Y1 - 1994

N2 - 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.

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

Abstract

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