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Characterization by Chemical Etching for Superconducting Bi2Sr2CaCu2O8 Crystals Grown by CO2-Laser Melting

Single crystals are grown directly from the melt in a rough size of (0.5–1.5)×(0.2–0.5)×(0.05–0.1) mm3. Comparing a pair of opposite surfaces created by cleaving, it has been recognized that the microstep line structure with the unit cell steps is generated at the instant of cleaving the crystal. With the aid of chemical etching it has further been clarified that the cleavage plane fractures into terraces hemmed by unit cell steps at crossing spiral dislocations. Simultaneously it has been proved that beak-pits observed among etch figures indicate the outcrop of dislocations. In addition it has been revealed by etching that stacking faults in a plane are involved in the crystal along the crystallographic a-axis.