DOI: https://doi.org/10.30970/jps.02.255
THE ROLE OF COPPER VALENCIES IN ORTHORHOMBIC YBa2Cu3Ox ON THE ELECTRICAL RESISTIVITY
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Journal of Physical Studies 2(2), 255–257 (1998)
DOI: https://doi.org/10.30970/jps.02.255 THE ROLE OF COPPER VALENCIES IN ORTHORHOMBIC YBa2Cu3Ox ON THE ELECTRICAL RESISTIVITY |
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V. Lovchinov, P. Simeonova
Institute of Solid State Physics, Bulgarian Academy of Sciences
Tzarigradsko Chaussee blvd., Sofia 1784, Bulgaria
An investigation of the temperature dependence of the resistivity $ρ (T)$ of the orthorhombic YBa$_2$Cu$_3$O$_x$ samples prepared by annealing and quenching was carried out. A distinction in some properties of the samples which possess identical oxygen content but are prepared by these two different methods is clearly demonstrated. An explanation connected with different processes of order–disorder and different amounts of Cu$^{3+}$ states in annealing and quenching specimens is proposed.