Surface outgrowth problem in c-axis oriented Y-Ba-Cu-O superconducting thin films
Ramesh, R. ; Inam, A. ; Hwang, D. M. ; Sands, T. D. ; Chang, C. C. ; Hart, D. L.
Woodbury, NY : American Institute of Physics (AIP)
Published 1991
Woodbury, NY : American Institute of Physics (AIP)
Published 1991
| ISSN: |
1077-3118
|
|---|---|
| Source: |
AIP Digital Archive
|
| Topics: |
Physics
|
| Notes: |
The origin of surface outgrowths in c-axis oriented superconducting Y-Ba-Cu-O thin films has been identified. We find that a,b-axis regions nucleate heterogeneously at second phase regions and rapidly grow outward, leading to the formation of lenticular-shaped outgrowths. The second phase has been identified by electron diffraction and high-resolution electron microscopy to be the Y1Ba3Cu2O7−x phase that forms as microscopic platelet-shaped precipitates on the a-b plane. The heterogeneous nucleation of such outgrowths is general and has been observed in both in situ sputtered and laser-deposited films. It is probably related to the ledge growth mechanism of the c-axis oriented Y-Ba-Cu-O thin film and to the precise overall composition of the film and needs to be studied in detail in order to produce films with smooth surfaces.
|
| Type of Medium: |
Electronic Resource
|
| URL: |