Crystal Structure and Tc of YBa2Cu3Oy (y>7)
Abstract
At a high oxygen pressure of 6 GPa, YBa2Cu3Oy was heat-treated. With an increasing supply of oxygen, the crystal structure of the processed specimens gradually changed from orthorhombic (y=7) to tetragonal (y=7.7), whereas the onset of superconducting transition temperature consistently remained at 92 K for all of the specimens. The distribution of charges among the copper-oxygen chains and the CuO2 sheets in YBa2Cu3Oy (y>7) are discussed.
- Publication:
-
Japanese Journal of Applied Physics
- Pub Date:
- August 1991
- DOI:
- Bibcode:
- 1991JaJAP..30L1378O
- Keywords:
-
- Crystal Structure;
- Heat Treatment;
- High Temperature Superconductors;
- Hole Distribution (Electronics);
- Transition Temperature;
- Yttrium Oxides;
- Barium Oxides;
- Copper Oxides;
- Magnetic Permeability;
- Solid-State Physics