Abstract
Slowly cooled samples of the tetragonal superconductor LaBa1.5Ca0.5Cu3Oz show a ''double plateau'' in plots of T-c against z, whereas quenched samples show a linear variation. No evidence for superstructure formation is observed by electron diffraction. Unit-cell parameters a and c vary linearly with x for slowly cooled samples, but non-linearly for quenched samples. For a given z, the difference in T-c of quenched and slow-cooled samples may indicate a net transfer of charge between the Cu(2)-oxygen planes and the Cu(1)-oxygen chains which is dependent on the thermal history of the samples rather than on ordering of oxygen vacancies.
Original language | English |
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Pages (from-to) | 137-142 |
Number of pages | 6 |
Journal | Physica C: Superconductivity and its Applications |
Volume | 260 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 1 Apr 1996 |
Keywords
- OXYGEN STOICHIOMETRY
- ELECTRON-DIFFRACTION
- SUPERCONDUCTIVITY
- YBA2CU3O7-DELTA
- TEMPERATURE
- BA2YCU3OX