Crystal structure of the high-temperature superconductor Tl2Ba2CaCu2O8
Abstract
X-ray diffraction data for a single crystal of the 2212 phase of the high-temperature superconductor Tl2Ba2CaCu2O8, which has an onset temperature of about 112 K, are presented. The crystal structure, based on a body-centered tetragonal cell with a = 3.8550(6) A and c = 29.318(4) A (space group I4/mmm), is essentially the same as that of Bi2Sr(3-x)Ca(x)Cu2O8 and comprises double copper-oxygen sheets alternating with double thallium-oxygen layers. There are Ca(2+) cations between adjacent Cu-O sheets and Ba(2+) cations between the Cu-O and Tl-O layers. The copper-oxygen chains present in YBa2Cu3O7 are absent in Tl2Ba2CaCu2O8.
- Publication:
-
Nature
- Pub Date:
- March 1988
- DOI:
- 10.1038/332420a0
- Bibcode:
- 1988Natur.332..420S
- Keywords:
-
- Crystal Structure;
- High Temperature Superconductors;
- Mixed Oxides;
- Single Crystals;
- Thallium Compounds;
- X Ray Diffraction;
- Barium Oxides;
- Bismuth Compounds;
- Calcium Oxides;
- Copper Oxides;
- Crystallography;
- Magnetic Flux;
- Solid-State Physics