High-temperature resistance behavior of Bi2Sr2CaCu2O8 + y and YBa2Cu3O7 - x superconductors
Abstract
High- and low-temperature resistance measurements have been carried out on Bi2Sr2CaCu2O8+y and YBa2Cu3O7-x in air and in vacuum. Both the ceramics exhibit a significant change in oxygen content during annealing between 350 and 450 °C. The Bi2Sr2CaCu2O8+y sample exhibits an increase in resistance with increased oxygen content resulting in deterioration of superconductivity, whereas YBa2Cu3O7-x shows improvement in superconducting behavior with increase in oxygen content. Consequently Bi2Sr2CaCu2O8+y prepared by fast cooling from the sintering temperature possesses a higher Tc , whereas slow cooling of YBa2Cu3O7-x produces a higher Tc .
- Publication:
-
Applied Physics Letters
- Pub Date:
- November 1988
- DOI:
- 10.1063/1.100498
- Bibcode:
- 1988ApPhL..53.2093B
- Keywords:
-
- Bismuth Oxides;
- Electrical Resistance;
- High Temperature Superconductors;
- Mixed Oxides;
- Superconductivity;
- Thermal Resistance;
- Calcium Oxides;
- Copper Oxides;
- Sintering;
- Strontium Compounds;
- Transition Temperature;
- Yttrium Oxides;
- Solid-State Physics