Micro-Raman analysis of Bi Sr Ca Cu O superconducting thin films deposited by pulsed laser evaporation

AbstractThe formation of superconducting thin films on lanthanum aluminate substrates is very important for high‐frequency applications. In this paper, we discuss the fabrication of epitaxial superconducting YBa2Cu3O7 thin films on (100)LaAlO3 substrates, which exhibit excellent dielectric properties required for high frequency applications. The films were deposited by the biased pulsed laser evaporation technique (PLE) at substrate temperatures between 500‐650°C and exhibit excellent crystallinity with best minimum ion channeling yields corresponding to approximately 3%. The superconducting transition temperatures varied from 88‐92 K with critical current densities at 77K and zero magnetic field greater than 4 ‐ 5 x 106 Amps/cm2.

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Theoretical model for deposition of superconducting thin films using pulsed laser evaporation technique

Journal of Applied Physics ◽

10.1063/1.347123 ◽

1990 ◽

Vol 68 (1) ◽

pp. 233-247 ◽

Cited By ~ 205

Author(s):

R. K. Singh ◽

O. W. Holland ◽

J. Narayan

Keyword(s):

Thin Films ◽

Theoretical Model ◽

Pulsed Laser ◽

Laser Evaporation ◽

Superconducting Thin Films ◽

Evaporation Technique

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BiSrCaCuO superconducting thin films prepared by pulsed laser evaporation deposition

Solid State Communications ◽

10.1016/0038-1098(88)91042-3 ◽

1988 ◽

Vol 67 (4) ◽

pp. 345-347 ◽

Cited By ~ 25

Author(s):

J. Perrière ◽

E. Fogarassy ◽

G. Hauchecorne ◽

X.Z. Wang ◽

C. Fuchs ◽

...

Keyword(s):

Thin Films ◽

Pulsed Laser ◽

Laser Evaporation ◽

Superconducting Thin Films

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Pulsed Laser Deposition of High Tc Superconducting Thin Films: Deposition Physics and in-Situ Processing

MRS Proceedings ◽

10.1557/proc-169-423 ◽

1989 ◽

Vol 169 ◽

Cited By ~ 2

Author(s):

Rajiv K. Singh ◽

J. Narayan

Keyword(s):

Thin Films ◽

Three Dimensional ◽

Pulsed Laser ◽

Laser Evaporation ◽

Superconducting Thin Films ◽

High Tc ◽

Ion Channeling ◽

In Situ Fabrication ◽

Current Densities

AbstractThe pulsed laser evaporation (PLE) technique for deposition of thin films is characterized by a number of unique properties. Based on the experimental characteristics, a theoretical model is developed which considers the formation and anisotropic three dimensional expansion of the laser generated plasma. This model explains most of the experimental features observed in PLE. We have also employed the PLE technique for in-situ fabrication of YBa2Cu3O7 superconducting thin films on different substrates in the temperature range of 500–650°C. At temperatures below 600–C, a biased interposing ring between the substrate and the target was found to significantly improve the superconducting properties. The minimum ion channeling yields were between 3-3.5 % for films deposited on (100) SrTiO3 and (100) LaA1O3 substrates. The films exhibit very high critical current densities (Jc) with maximum values exceeding 6.5 x 106 amps/cm2 for silver doped YBa2Cu3O7 films on (100) LaA1O3 substrates, and the Jc also varies anisotropically with the magnetic field.

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