caa a22 4500 445380047 CHVBK 20180317143014.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10948-011-1174-9 doi (NATIONALLICENCE)springer-10.1007/s10948-011-1174-9 Investigation of Gd Addition Added on Magnetic and Structural Properties of Bi1.8Pb0.35Sr1.9Ca2.1Cu3Gd x O y Superconductors by ac Susceptibility [Elektronische Daten] [G. Yildirim, Y. Zalaoglu, M. Akdogan, S. Altintas, A. Varilci, C. Terzioglu] This study reports the effect of Gd addition on magnetic and structural properties of Bi1.8Pb0.35Sr1.9Ca2.1Cu3Gd x O y superconductor with x=0, 0.1, 0.2, 0.3, 0.4 and 0.5 by means of ac susceptibility measurements at various ac fields (ranging from 270 to 1352A/m) and scanning electron microscopy (SEM) images. Critical onset ( $T_{\mathrm{c}}^{\mathrm{on}})$ and loss peak temperatures (T p) were qualitatively estimated from the ac susceptibility curves. The peak temperature at zero ac-magnetic field (T p0) and intergrain critical current densities (J c) were theoretically calculated from the ac susceptibility plots via the critical state models. The results show that peak temperatures and critical current densities were found to decrease with increasing Gd addition. Moreover, using a self-field approximation together with J c dependence on temperature, the characteristic length (L c) associated with the pinning force is estimated to be approximately the same as the average grain size (R g) of the pinning center because of the linear decrease in J c with increasing temperature. Surface morphology and grain connectivity of the samples were also obtained to degrade with increase in the Gd addition from SEM investigations. The Author(s), 2011 Bi1.8Pb0.35Sr1.9Ca2.1Cu3Gd x O y nationallicence Ac susceptibility nationallicence Critical state models nationallicence Critical current density nationallicence Peak temperature nationallicence Scanning electron microscopy nationallicence Yildirim G. Department of Physics, Abant Izzet Baysal University, 14280, Bolu, Turkey aut Zalaoglu Y. Department of Physics, Osmaniye Korkut Ata University, 80000, Osmaniye, Turkey aut Akdogan M. Department of Physics, Abant Izzet Baysal University, 14280, Bolu, Turkey aut Altintas S. Department of Physics, Abant Izzet Baysal University, 14280, Bolu, Turkey aut Varilci A. Department of Physics, Abant Izzet Baysal University, 14280, Bolu, Turkey aut Terzioglu C. Department of Physics, Abant Izzet Baysal University, 14280, Bolu, Turkey aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/7(2011-10-01), 2153-2159 1557-1939 24:7<2153 2011 24 10948 https://doi.org/10.1007/s10948-011-1174-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-011-1174-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yildirim G. Department of Physics, Abant Izzet Baysal University, 14280, Bolu, Turkey aut NATIONALLICENCE 700 1- Zalaoglu Y. Department of Physics, Osmaniye Korkut Ata University, 80000, Osmaniye, Turkey aut NATIONALLICENCE 700 1- Akdogan M. Department of Physics, Abant Izzet Baysal University, 14280, Bolu, Turkey aut NATIONALLICENCE 700 1- Altintas S. Department of Physics, Abant Izzet Baysal University, 14280, Bolu, Turkey aut NATIONALLICENCE 700 1- Varilci A. Department of Physics, Abant Izzet Baysal University, 14280, Bolu, Turkey aut NATIONALLICENCE 700 1- Terzioglu C. Department of Physics, Abant Izzet Baysal University, 14280, Bolu, Turkey aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/7(2011-10-01), 2153-2159 1557-1939 24:7<2153 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer