Flux pinning in ternary (Nd-Eu-Gd)Ba[sub 2]Cu[sub 3]O[sub 7-δ]: Optimization for the highest pinning

Pradhan, A. K.; Pradhan, A.K.; Muralidhar, M.; Feng, Y.; Murakami, M.; Nakao, K.; Koshizuka, N.
September 2000
Applied Physics Letters;9/25/2000, Vol. 77 Issue 13
Academic Journal
The optimization of high-quality melt-processed ternary (Nd-Eu-Gd)Ba[sub 2]Cu[sub 3]O[sub 7-δ] composite samples has been carried out to achieve the largest pinning. Our results suggest that the interaction between the twin planes and the fine second-phase precipitate forms a strongly pinned entangled vortex liquid in which vortices are correlated along the c axis. This pinned vortex liquid freezes into a glassy state at low temperature rendering high critical current density, J[sub c]. The maximum J[sub c] can be achieved in as-grown optimally annealed twinned sample with second phase precipitate without disturbing the twin influence. © 2000 American Institute of Physics.


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