Superconductivity in the high-Tc Bi-Ca-Sr-Cu-O system: Phase identification
Abstract
Four phases are observed in superconducting Bi-Ca-Sr-Cu-O samples. The superconducting phase, with onset temperature near 120 K, is a 15.4-Å-layered compound with composition near Bi2Ca1Sr2O9 and an A-centered orthorhombic unit subcell 5.41×5.44×30.78 Aṧ. X-ray diffraction and electron microscopy data are consistent with a structure of alternating perovskite and Bi2O2 layers. High-resolution transmission electron microscopy images reveal a b-axis superstructure of 27.2 Å, numerous (001) stacking faults, and other defects.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 1988
- DOI:
- Bibcode:
- 1988PhRvL..60.1174H
- Keywords:
-
- Critical Temperature;
- High Temperature Superconductors;
- Mixed Oxides;
- Solid Phases;
- Superconductivity;
- Bismuth Oxides;
- Calcium Oxides;
- Copper Oxides;
- Strontium Compounds;
- X Ray Diffraction;
- Solid-State Physics;
- 74.70.Vy