Structural properties of oxygen-deficient

✍ Scribed by Jorgensen, J. D.; Veal, B. W.; Paulikas, A. P.; Nowicki, L. J.; Crabtree, G. W.; Claus, H.; Kwok, W. K.

• Book ID: 118012407
• Publisher: The American Physical Society
• Year: 1990
• Tongue: English
• Weight: 899 KB
• Volume: 41
• Category: Article
• ISSN: 1098-0121
• DOI: 10.1103/physrevb.41.1863

✦ Synopsis

The structural properties of oxygen-deficient YBazCu30& z have been determined by neutron powder diffraction for 0.07 & 5 &0.91. The samples were produced by quenching into liquid nitro- gen from controlled oxygen partial pressures at 520'C, and they exhibit a clearly defined "plateau" behavior of T, versus 6. Superconductivity disappears at the orthorhombic-to-tetragonal transition that occurs near 6=0.65. Structural parameters, including the copper-oxygen bond lengths, vary smoothly with 6 within each phase but exhibit different behavior in the superconducting and nonsu- perconducting phases. These observations are consistent with a model in which superconducting behavior is controlled by charge transfer between the conducting two-dimensional CuOz planes and the CuO"chains, which act as reservoirs of charge.