NDLI: Effect of the Ball-Milling Technique on the Transport Current Density of Polycrystalline Superconductor YBa$_{ 2 }$Cu$_{ 3 }$O$

Content Provider	Springer Nature Link
Author	Hannachi, E. Hamrita, A. Slimani, Y. Ben Salem, M. K. Zouaoui, M. Salem, M. Ben Azzouz, F. Ben
Copyright Year	2014
Abstract	We have studied the flux-pinning mechanisms of YBa $_{2}$Cu $_{3}$ O $_{ y }$ (Y-123) and YBa $_{2}$Cu $_{3}$ O $_{ y }$ embedded by Y-deficient Y-123 nanoparticles induced by planetary ball-milling technique. Samples were synthesized in air using a standard solid-state reaction technique by considering a thermal cycle with two stages of sintering at 950 °C separated by intermediate crushing; a traditional crushing (in a mortar) and another energetic (in a planetary crusher). Phase analysis by X-ray diffraction (XRD), granular structure examination by scanning electron microscopy (SEM), microstructure investigation by transmission electron microscopy (TEM), and the global critical current density dependence on temperature (J $_{ct}$(T)) at several applied magnetic fields were carried out. The temperature dependence of J $_{ct}$(T) was analyzed within the collective pinning model. For both samples and at self-magnetic field, the temperature dependence of the critical current density is in agreement with the δ T $_{c}$ pinning mechanism which is due to the spatial fluctuation of the Ginsburg-Landau coefficient associated with the transition temperature T $_{c}$. Under an applied magnetic field of 100 mT there is evidence of δ ε and δ l pinning mechanisms in the unmilled sample; however, the δ ε pinning is strongly dominant in the milled one These results agree with TEM observations showing the appearance of defects and contrast deformation due to the nanophases generated by ball milling and embedded inside the superconducting matrix.
Starting Page	493
Ending Page	498
Page Count	6
File Format	PDF
ISSN	15571939
Journal	Journal of Superconductivity and Novel Magnetism
Volume Number	28
Issue Number	2
e-ISSN	15571947
Language	English
Publisher	Springer US
Publisher Date	2014-09-24
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	YBCO superconductor Planetary ball milling Critical current Flux-pinning mechanisms 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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