ISSN:
1572-9605
Keywords:
Magnetic hysteresis
;
flux creepweak links
;
pinning force
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract Gd0.95Ba2Cu3.05O7−δ: Agx (x=0.0, 0.02, 0.04, 0.06) ceramic superconducting samples were prepared by a co-precipation technique using organic carbonates in the presence of stable polymers. The room-temperature normal-state resistivity decreases with Ag addition. However,T cand crystallographic parameters were uneffected. Low-temperature (4.2 K) magnetic and electrical transport studies in high magnetic fields (5 T) reveal that the addition of Ag into the Gd0.95Ba2Cu3.05O7−δ (GBCO) enhances the magnetic critical current density (J mc), volume pinning force (F p), flux explusion, and transport critical current density (J tc). Microwave-induced dc voltage studies show the reduction in the total number of weak links between superconducting GBCO grains with increase in Ag concentration. The flux creep rate was also increased with increase in Ag concentration in GBCO resulting in stronger pinning potential. The increase inJ mc, Jtc, and, hence,F pwith Ag addition in the GBCO suggests the creation of an SNS-type proximity junction at the intergrannular region and stronger Josephson current paths between the superconducting intergrains, which may be due to the physical densification and reduction of the total number of weak links by Ag addition into the GBCO superconducting system.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00626271
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