Growth, microstructures, and superconductivity of Bi2−xPbxSr2Ca1−yGdyCu2O8+z single crystals

Bi 2−x Pb x Sr 2 Ca 1−y Gd y Cu 2 O 8+δ  (x=0.34 and y=0.18, 0.34) crystals were grown by the self-flux method. The crystals have a cleavage thickness of only half unit cell up to two unit cells with Tc only dropping 20 K as y is increased from 0.18 to 0.34 for as-grown crystals. However, Tc increas...

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Veröffentlicht in:Journal of applied physics 2004-06, Vol.95 (11), p.6699-6701
Hauptverfasser: Wang, X. L., Takayama-Muromachi, E., Li, A. H., Cheng, Z. X., Keshavarzi, S., Qin, M. J., Dou, S. X.
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Sprache:eng
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Zusammenfassung:Bi 2−x Pb x Sr 2 Ca 1−y Gd y Cu 2 O 8+δ  (x=0.34 and y=0.18, 0.34) crystals were grown by the self-flux method. The crystals have a cleavage thickness of only half unit cell up to two unit cells with Tc only dropping 20 K as y is increased from 0.18 to 0.34 for as-grown crystals. However, Tc increased to almost the same value of about 80 K after annealing in air regardless of the Gd doping levels. The co-doping produced enhanced flux pinning compared to the sole Gd doping. A secondary peak effect presented in crystals with x=0.34 and y=0.34 was explained by phase segregations containing Gd-rich clusters.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1667412