ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Pulsed-laser ablation has been used to grow epitaxial films of Bi2Sr2CaCu2O8−x (Bi-2212) and Bi2Sr2CuO6−x (Bi-2201) on (001) MgO with entirely in situ processing. The films' layer-stacking sequence, microstructure, and superconducting Tc are highly sensitive to the growth temperature and deposition rate. Pure Bi-2212 films exist over only a narrow temperature range. Pure Bi-2201 films appear at higher growth temperature, while lower growth temperature enhances the Bi-2223 phase, though it is mixed with Bi-2212. The phase homogeneity, in-plane connections among grains, and superconducting Tc of Bi-2212 grown at a given temperature are greatly improved by reducing the deposition rate. Epitaxial Bi-2212 films grown at 740 °C and 0.5 Hz (∼0.05 nm/s) have Tc0 (R=0)=71 K, with Jc∼8×105 A/cm2 at 50 K and Jc∼5×106 A/cm2 at 4.2 K.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.110008
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