NDLI: Coexistence of Superconductivity and Ferromagnetic Phases in YBa$_{2}$Cu$_{3}$O$

Content Provider	Springer Nature Link
Author	Arabi, H. Jamshidi, S. Komeili, M. Amirabadizadeh, A.
Copyright Year	2012
Abstract	High-temperature superconductor YBa$_{2}$Cu$_{3}$O$_{7−δ }$ (YBCO) nanopowders were synthesized by the citrate-gel route, which is a modification of the sol-gel method. The fine powders were calcinated at 860 and 900 °C. They were of small size, in the range of 30–35 nm. X-ray diffraction (XRD) patterns verified production of the orthorhombic superconducting phase in all samples. Measuring the magnetic properties of these nanoparticles at room temperature, via a vibrating sample magnetometer (VSM), indicated ferromagnetism behavior in the YBa$_{2}$Cu$_{3}$O$_{7−δ }$ nanoparticles. As the size of the nanoparticles decreased, the magnetic saturation of all samples increased. The development of the ferromagnetism effect was attributed to the presence of surface oxygen vacancies that lead to electron redistribution on the different ions at the surface. Thus, in an innovative work, the produced samples were annealed at 700 °C for 5 h under 0.8–0.9 bar of air atmosphere. The results showed that a small increase in the nanoparticle size provided a dramatic increase of magnetic saturation in all samples. Thus, we can say that the annealing process at vacuum improves the ferromagnetic properties of YBCO nanoparticles.
Starting Page	2069
Ending Page	2071
Page Count	3
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	26
Issue Number	5
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2012-12-30
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Superconductivity Ferromagnetism Nanoparticles Coexistence YBCO Strongly Correlated Systems, Superconductivity Magnetism, Magnetic Materials Condensed Matter Physics Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Condensed Matter Physics

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