Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 8: Postersitzung I: Supraleitung

TT 8.4: Poster

Montag, 8. März 2004, 14:30–19:00, Poster A

Growth and superconducting properties of ternary rare earth (Gd, Eu, Nd)Ba₂Cu₃O_y thin films — •C. Cai, J. Hänisch, L. Fernandez, and B. Holzapfel — IFW Dresden, D-01171 Dresden, Germany

Ternary rare earth (Gd_1/3Eu_1/3Nd_1/3)Ba₂Cu₃O_y (GEN123) thin films are prepared with off-axis laser ablation technique. Compared with mono-rare earth 123 films, GEN123 films show higher critical current density (J_c) and improved irreversibility field (H_irr), but no increase in the characteristic field corresponding to a crossover from low-field plateau to a linear region in logJ_c-logH plot. At intermediate fields, J_c vs. H scales as H^−0.5 for GEN123, in contrast to H^−0.73 for mono-rare earth samples such as Gd123. The slow power decay of J_c vs. H together with the improved J_c and H_irr strongly imply the extra flux pinning centres existing in GEN123, which are suggested to be non-correlated stress field induced by lattice mismatch.