Abstract
The surface modifications of as-grown superconducting Bi-Sr-Ca-Cu-O (BSCCO) films prepared by radio frequency plasma flash evaporation were carried out with a scanning tunneling microscope (STM). The as-grown films were identified as highly c-axis-oriented, low Tc (80 K) phase Bi2Sr2Ca1Cu2Ox with some residue such as (Sr,Ca)3Cu5Ox from x-ray diffraction patterns. The as-grown film deposited at about 750 °C exhibited a superconducting critical temperature Tc of 76 K and a critical current density Jc of 8.8×104 A/cm2 under zero magnetic field at 27 K. The nanometer-size surface modifications between 2 and 50 nm, especially layered etching, of the prepared BSCCO films were successfully performed by using a STM in air.
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