Electrical conductivity and thermogravimetric studies of the high-T(c) superconductor YBa2Cu3O(x)
Abstract
Nonstoichiometry in YBa2Cu3O(x) has been studied by means of equilibrium electrical conductivity and thermogravimetric method. A strong correlation between electrical resistivity and oxygen stoichiometry (x) at high temperature has been observed. Electrical resistivities increase linearly from the superconducting onset temperature (100 K) to 450 C where oxygen stars to evolve from this material, and then begin to deviate from linear temperature dependence. The experimental results indicate that electrical resistivity in this material is associated with the defect species (charge carrier) population due to oxygen stoichiometry. Electrical conductivities were also measured as a function of oxygen partial pressure (1 to 0.0001 atm) at various temperatures. The conductivity behavior with oxygen stoichiometry suggests that the electron holes associated with Cu(3+) play an important role as charge carriers in this material, and even at x less than 6.5 p-type conduction is predominant.
- Publication:
-
High-Temperature Superconductors
- Pub Date:
- 1988
- Bibcode:
- 1988mrs..proc..753H
- Keywords:
-
- Critical Temperature;
- Electrical Resistivity;
- High Temperature Superconductors;
- Mixed Oxides;
- Thermogravimetry;
- Barium Oxides;
- Copper Oxides;
- Heat Treatment;
- Yttrium Oxides;
- Solid-State Physics