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Erschienen in:
01.12.2014
Evolution of the electrical resistance of \(\bf{\hbox {YBa}_2\hbox {Cu}_3\hbox {O}_{7-\varvec\delta }}\) single crystals in the course of long-term aging
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 12/2014
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Abstract
Investigated are the changes in the basal-plane electrical resistivity of an optimally doped \(\hbox {YBa}_2\hbox {Cu}_3\hbox {O}_{7-\delta }\) single crystal in the course of long-term aging (17 years) at room temperature in air. In consequence of aging the sample has decomposed into three phases with different temperatures of the superconducting transition, while the transition widths of these phases have increased significantly. The temperature dependence of the electrical resistivity has retained a metallic character. The fluctuation conductivity near the critical temperature is described well by the 3D Aslamazov–Larkin model. In the course of aging significant changes in the scattering characteristics have been observed, whereas the Debye temperature has changed slightly and the transverse coherence length has remained constant.