STM images and STS of Bi2Sr2CaCu2O8+δ

✍ Scribed by C. Manabe; M. Oda; M. Ido

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 437 KB
• Volume: 235-240
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(94)91623-3

✦ Synopsis

Clear atomic images of Bi2Sr2CaCu208+ ~ cleaved surfaces were observed at 4.2 K and 300 K by using scanning tunneling microscopy (STM). The atomic image taken under bias voltages much lower than the semiconducting gap of the Bi-O plane is of a square-lattice, which seems to be of the Cu-O plane. A modulation structure along the b-axis is seen as the change in brightness with the period of-5 atomic intervals. The tunneling spectrum at 4.2 K is almost the same in bo|h relatively bright and dark regions of the medulation structure, and in qualitative agreement with that of a gapless superconductor.