Comparative Study of the Effect of Magnetic Nanoparticle CoFe2O4 on Fluctuation-Induced Conductivity of Y-123 and Y-358 Superconductors

Comparative Study of the Effect of Magnetic Nanoparticle CoFe2O4 on Fluctuation-Induced... In this study, a comparative investigation of the electrical conductivity fluctuations in nano-CoFe O added to 2 4 Y Ba Cu O (Y-358) and YBa Cu O (Y-123) products is performed. All products were made using the solid-state 3 5 8 18±x 2 3 7−d reaction process. X-ray powder diffraction (XRD) analyses confirmed the formation of different phases. Scanning electron microscope (SEM) analysis shows the reduction of grain size with increasing the quantity of nano-CoFe O particles for 2 4 both the Y-123 and Y-358 samples. The decrease of grain size is more accentuated in the case of the Y-358 samples compared with the Y-123 ones. The data of conductivity fluctuations are examined in terms of the derivative of the electrical resistivity with respect to temperature and the logarithmic derivative of the conductivity with regard to temperature. The results illustrate the existence of a transition with two stages; intragrain and intergrain. It is demonstrated that the addition of CoFe O nanoparticles affects the electrical conductivity fluctuations, the values of the critical exponents, and the fluctuation 2 4 dimensionality in YBCO systems. Keywords YBCO superconductors · CoFe O nanoparticles · Structure · Fluctuation-induced conductivity · 2 4 Critical phenomena 1 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Superconductivity and Novel Magnetism Springer Journals

Comparative Study of the Effect of Magnetic Nanoparticle CoFe2O4 on Fluctuation-Induced Conductivity of Y-123 and Y-358 Superconductors

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Physics; Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials
ISSN
1557-1939
eISSN
1557-1947
D.O.I.
10.1007/s10948-018-4746-0
Publisher site
See Article on Publisher Site

Abstract

In this study, a comparative investigation of the electrical conductivity fluctuations in nano-CoFe O added to 2 4 Y Ba Cu O (Y-358) and YBa Cu O (Y-123) products is performed. All products were made using the solid-state 3 5 8 18±x 2 3 7−d reaction process. X-ray powder diffraction (XRD) analyses confirmed the formation of different phases. Scanning electron microscope (SEM) analysis shows the reduction of grain size with increasing the quantity of nano-CoFe O particles for 2 4 both the Y-123 and Y-358 samples. The decrease of grain size is more accentuated in the case of the Y-358 samples compared with the Y-123 ones. The data of conductivity fluctuations are examined in terms of the derivative of the electrical resistivity with respect to temperature and the logarithmic derivative of the conductivity with regard to temperature. The results illustrate the existence of a transition with two stages; intragrain and intergrain. It is demonstrated that the addition of CoFe O nanoparticles affects the electrical conductivity fluctuations, the values of the critical exponents, and the fluctuation 2 4 dimensionality in YBCO systems. Keywords YBCO superconductors · CoFe O nanoparticles · Structure · Fluctuation-induced conductivity · 2 4 Critical phenomena 1

Journal

Journal of Superconductivity and Novel MagnetismSpringer Journals

Published: May 29, 2018

References

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