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The Effect of Doping on the Magnetic Properties in {\rm Ba}{({\rm Fe}_{1-x}{\rm Co}_{x})}_{2}{\hbox {As}}_{2} Polycrystalline Samples

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14 Author(s)
G. Celentano ; ENEA CR Frascati, Frascati, Italy ; G. De Marzi ; S. Gaudio ; A. Augieri
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We performed an extensive characterization of Co-doped polycrystalline 122 iron pnictide samples, Ba(Fe1-xCox)2As2 with x=0.07, 0.09, 0.1, 0.12, by means of high-field dc magnetization and ac 1st and 3rd harmonic susceptibility response measurements. From M(H) loops through the Bean model formula both the magnetic field and T dependences of the Jc are derived. From the 3rd harmonic response of the ac susceptibility as a function of the dc magnetic field up to 10 T recorded at different temperatures, we determined the irreversibility line, using the onset criterion. From these analyses, 7% and 9% of Co-doped samples showed the best Jc performances.

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:21 ,  Issue: 3 )