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Cu-O vibrations of Ba/sub 2/YCu/sub 3/O/sub x/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
We present Raman and infrared absorption data for Ba/sub 2/YCu/sub 3/O/sub x/ 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 xapprox. =6.5. We have examined both phases for the frequency range ..omega..>400 cm/sup -1/ 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 Ba/sub 2/YCu/sub 3/O/sub 7/ being absent in the nonsuperconducting Ba/sub 2/YCu/sub 3/O/sub 6/.
Research Organization:
ATandT Bell Laboratories, Murray Hill, New Jersey 07974
OSTI ID:
5923245
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 36:1; ISSN PRBMD
Country of Publication:
United States
Language:
English

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