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Published in:
01-03-2015
Effect of defects on the basal-plane resistivity of \(\hbox {YBa}_2\hbox {Cu}_3\hbox {O}_{7-\delta }\) and \(\hbox {Y}_{1-y}\hbox {Pr}_y\hbox {Ba}_2\hbox {Cu}_3\hbox {O}_{7-x}\) single crystals
Published in: Journal of Materials Science: Materials in Electronics | Issue 3/2015
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Abstract
Temperature dependences of the basal-plane resistivity of \(\hbox {YBa}_2\hbox {Cu}_3\hbox {O}_{7-\delta }\) single crystals with different oxygen deficiency levels \(\delta\) are investigated in the temperature interval \(T_c\)–300 K. In this temperature range, these dependences, alike those for \(\hbox {Y}_{1-y}\hbox {Pr}_y\hbox {Ba}_2\hbox {Cu}_3\hbox {O}_{7-x}\) with various Pr content, \(y\), can be described with great accuracy by an expression accounting for electron scattering on phonons and defects, as well as the fluctuation conductivity within the 3D Aslamazov–Larkin model. Our analysis shows that for both compounds the scattering characteristics for the charge carriers in the layer planes are determined by defects in the \(\hbox {CuO}_2\) layers, which arise owing to changes in the oxygen deficiency or in the Pr content. Our data suggest that the fluctuation parameters are affected by the total defect concentration rather than by the oxygen deficiency. The dependences \(T_c(\delta )\) for \(\hbox {YBa}_2\hbox {Cu}_3\hbox {O}_{7-\delta }\) and \(T_c(y)\) for \(\hbox {Y}_{1-y}\hbox {Pr}_y\hbox {Ba}_2\hbox {Cu}_3\hbox {O}_{7-x}\) are similar, especially for \(y,\delta <0.2\), and both can be ascribed to the suppression of superconductivity by defects.