Publication Details:
Journal or Publication Title:
Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես
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Creator:
Nikoghosyan, S. K. ; Sargsyan, A. G. ; Zargaryan, Y. G. ; Aivazyan, A. ; Hakopyan, A.
Subject:
Uncontrolled Keywords:
high temperature superconductor ; superconducting transition ; superconducting transition width ; onset and offset temperature of superconducting transition (ΔTc, Τcon, and Tc0) ; phase separation phenomenon
Coverage:
Abstract:
The effect of the location with different concentrations of La atoms (x = 0; 0.02; 0.028; 0.11) on some superconducting and electrotransport characteristics of Y1−xLaxBa2Cu3Oy polycrystalline compounds was studied by recording the temperature dependence ρ(T) curves of resistivity in the case of direct current in the range of temperatures (77K - 300K). The temperatures at the onset (Τcon) and offset (Tc0) of the transition, as well as the width of the transition - ΔΤc = Τcon-Tc0, were considered as the superconducting characteristics. The absolute values of ρ(300K) and ρ(100K) and their ratio a = ρ(300K)/ρ(100K) were considered as electric transport characteristics, as well as the temperature coefficient of resistivity dρ/dT, which was determined by ρ(T) in the range of linear dependence with the slope of the curve. From the comparison of these characteristics, it was concluded that there is a certain correlation between the superconducting and electrotransport properties of the studied compounds depending on the concentration x of the partial location of Y atoms with La.