Ac Magnetic Susceptibility and EPR Studies of (Co0.5Zn0.5Fe2O4)(x)/(Cu0.5Tl0.5)-1223 Composites

作者：I**er S; Barakat M M E; Al Sayyed N; Noureddine S; Awad R

来源：Journal of Superconductivity and Novel Magnetism, 2017, 30(6): 1673-1680.

DOI：10.1007/s10948-016-3677-x

• (Cu center dot Tl)-1223
• Ac magnetic susceptibility
• EPR
• Magnetic moment

Cobalt zinc ferrite nanoparticles (Co0.5Zn0. 5Fe2O4) (x) (similar to 5-8 nm in size) added to Cu0.5Tl0.5Ba2Ca2Cu3O10-delta superconductor samples, 0.00 aexae 0.20 wt. %, were prepared using a singlestep solid-state reaction technique. The temperature dependence of the real (chi (')) and imaginary (chi (aEuro3)) components of the magnetic susceptibility (ACMS) was measured at various ac magnetic field amplitudes (3-16 Oe). The results were analyzed by using Bean critical state model to estimate the critical current density (J (c)) It was found that J (c) increases as x increases up to 0.08 and then it decreases with further increase in x. X- and Q-Band (9.3 and 33. GHz) electron paramagnetic resonance (EPR) spectra were measured in the temperature range from 300 to 10 K.The g values of Cu (2+) monomer were found to correspond to that of rhombic site symmetry with g (xx) = 2.21 +/- 0.02, g (yy) = 2.10 +/- 0.02, and g (zz) = 2.02 +/- 0.02.

• 出版日期2017-6