caa a22 4500 44538221X CHVBK 20180317143020.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0968-5 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0968-5 Detailed Elaboration Method and Magnetic Study ofNanometrical YBCO/YIG System [Elektronische Daten] [S. Khene, M. Gasmi, G. Fillion] The blending of magnetic elements or compounds into a superconducting matrix has a direct effect on the physical properties of the latter and provides precious information on the superconductivity mechanisms, the spin/vortex interaction and the vortex pinning. To our knowledge, no study of the addition of nanoparticles of yttrium iron garnet Y3Fe5O12 (called commonly YIG) in the yttrium, barium and copper oxide YBa2Cu3O7−δ (well known under the YBCO appellation) nanometrical matrix has been performed up to the present time. The YBCO and YIG powders have been elaborated by a conventional ceramic process. The obtained products have been characterized by magnetization measurements, X-ray diffraction and optical microscopy. The used ways to reduce their grain sizes below 50 nm and to mix them avoiding the formation of grain crowds have been explained. Their nanometrical sizes have been confirmed by atomic force microscope analysis. Eight pellets have been elaborated. The thermal variations of zero field cooled magnetizations, in a residual field of 44 G, have shown that the introduction of 5 and 9% in weight of a non-superconductor material (YIG) into a superconducting matrix (YBCO) has reduced the T C only by 1K for a ybcoyig5% pellet and 1.57 K for a ybcoyig9% one, comparatively with the ybcopur reference pellet's T C. In another way, our results have shown that the incorporation of YIG in very low quantities, between 0 and 0.5% in weight of YIG, increases the value of the critical current J C of a ybcopur pellet (and, so, the vortex pinning). By fitting our experimental points starting from 0.5% in weight of YIG, an empirical law of the J C variation versus added YIG percentage is suggested. Springer Science+Business Media, LLC, 2010 Nanoparticles nationallicence Elaboration, YBa2Cu3O7− δ nationallicence Y3Fe5O12 nationallicence Critical current nationallicence Khene S. Physics Department, Badji Mokhtar University, PO Box 12, 23000, Annaba, Algeria aut Gasmi M. Physics Department, Badji Mokhtar University, PO Box 12, 23000, Annaba, Algeria aut Fillion G. LCMI, CNRS, 38042, Grenoble cedex 9, France aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 427-435 1557-1939 24:1-2<427 2011 24 10948 https://doi.org/10.1007/s10948-010-0968-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0968-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Khene S. Physics Department, Badji Mokhtar University, PO Box 12, 23000, Annaba, Algeria aut NATIONALLICENCE 700 1- Gasmi M. Physics Department, Badji Mokhtar University, PO Box 12, 23000, Annaba, Algeria aut NATIONALLICENCE 700 1- Fillion G. LCMI, CNRS, 38042, Grenoble cedex 9, France aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 427-435 1557-1939 24:1-2<427 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer