Abstract
Y3/4Lu1/4Ba2Cu3O7 + Y3Fe5O12 composites with different volume ratios of the starting components were synthesized. The composites model an S-F-S Josephson junction network, where S stands for a superconductor and F, for a ferrimagnet. A study of the transport characteristics of the composites revealed that the temperature behavior of the electrical resistivity ρ(T) below the superconducting transition point T C is different in two regions separated by a temperature T m. Below T m, the current-voltage characteristics of the composites are nonlinear, while in the interval from T C to T m the values of ρ(T) do not depend on the transport current j and magnetic field H. This behavior of ρ(T, j) and ρ(T, H) is assigned to specific features of the tunneling of superconducting carriers through the ferrimagnetic layers separating HTSC grains in the composite. Magnetic measurements showed the diamagnetic response of HTSC grains to be lower in composites with a ferrimagnet.
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Translated from Fizika Tverdogo Tela, Vol. 45, No. 10, 2003, pp. 1776–1783.
Original Russian Text Copyright © 2003 by Sha\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \)khutdinov, Balaev, Popkov, Petrov.
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Shaikhutdinov, K.A., Balaev, D.A., Popkov, S.I. et al. Transport and magnetic properties of Y3/4Lu1/4Ba2Cu3O7 + Y3Fe5O12 composites representing a Josephson-type superconductor-ferrimagnet-superconductor weak-link network. Phys. Solid State 45, 1866–1873 (2003). https://doi.org/10.1134/1.1620087
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DOI: https://doi.org/10.1134/1.1620087