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Cu-O vibrations of Ba2YCu3Ox

Michael Stavola, D. M. Krol, W. Weber, S. A. Sunshine, A. Jayaraman, G. A. Kourouklis, R. J. Cava, and E. A. Rietman
Phys. Rev. B 36, 850(R) – Published 1 July 1987
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Abstract

We present Raman and infrared absorption data for Ba2YCu3Ox with 7>x>6 for several samples with well-characterized oxygen content. Over this range the material has an oxygen-deficient tripled perovskite structure whose superconductivity properties depend critically on x. An orthorhombic-to-tetragonal transition occurs for x≊6.5. We have examined both phases for the frequency range ω>400 cm1 which contains the Cu-O bond-stretching vibrations. A force-constant model has been developed which allows us to assign the features in the spectra. Our results are consistent with the linear Cu-O-Cu-O chains in Ba2YCu3O7 being absent in the nonsuperconducting Ba2YCu3O6.

  • Received 11 May 1987

DOI:https://doi.org/10.1103/PhysRevB.36.850

©1987 American Physical Society

Authors & Affiliations

Michael Stavola, D. M. Krol, W. Weber, S. A. Sunshine, A. Jayaraman, G. A. Kourouklis, R. J. Cava, and E. A. Rietman

  • AT&T Bell Laboratories, Murray Hill, New Jersey 07974

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Vol. 36, Iss. 1 — 1 July 1987

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