High-Oxygen-Pressure Synthesis of Superconducting Tetragonal YBa_2Cu_3O_<7.7>
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A tetragonal form of YBa_2Cu_3O_y whose lattice parameters were a = 3.8715 Å and c = 11.6506 Å was prepared at a high oxygen pressure of 6 GPa and 1050℃. Using the value of oxygen content determined by oxygen analysis measurement, the tetragonal YBCO was expressed as YBa_2Cu_3O_<7.7> If the oxygen is assumed to be divalent as usual, the average valence of Cu becomes 2.8. The onset of the superconducting transition temperature was 92 K, nearly the same as usually obtained with YBCO; however, the volume fraction of superconductivity was a third of the usual YBCO.
- 社団法人応用物理学会の論文
- 1990-12-20
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