Epitaxial superconducting thin films Tl0.78Bi0.22Sr1.6Ba0.4Ca2O9−δ on (001) YSZ synthesized by laser ablation and post-annealing in pure argon

In this letter, we describe results obtained via laser ablation to fabricate Tl 2 Ba 2 Ca 2 Cu 3- O 10 superconducting thin films using a two-step process. We found that the zero-resistance temperatures are up to 121 K, while the onset temperatures are up to 125 K. The T c and J c are mainly determined by a non-contact new technique for high-T c films. The typical critical current density, J c , is about 106 A/cm 2 at 77 K. X-ray diffraction showed that the superconducting thin films are nearly single 2223 phase and are highly oriented.

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Laser Patterning and Electrical Properties of Submicron Lines of Y-Ba-Cu-O

MRS Proceedings ◽

10.1557/proc-158-485 ◽

1989 ◽

Vol 158 ◽

Author(s):

J. P Zheng ◽

Q. Y. Ying ◽

H. S. Kim ◽

D. Bhattacharya ◽

D. T. Shaw ◽

...

Keyword(s):

Thin Films ◽

Laser Ablation ◽

Electrical Properties ◽

Critical Current ◽

Laser Deposition ◽

Direct Laser Writing ◽

Laser Patterning ◽

Post Annealing ◽

Direct Laser ◽

Current Densities

ABSTRACT0.6 µm-wide lines of high Tc Y-Ba-Cu-O have been fabricated by direct laser writing on mirror-like thin films which were grown by laser deposition without post annealing. Laser ablation etching had no effect on the Tc and Jc until the lines were < 1µm wide. The 0.6 µm-wide strip showed some degradation of Tc and Jc. The critical current densities for these patterned lines were measured to be ∼5×106 A/cm2 at 50 K.

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Post-annealing induced defects and their influences on Bi2Sr2CaCu2Oy superconducting thin films

Journal of Materials Research ◽

10.1557/jmr.1995.1872 ◽

1995 ◽

Vol 10 (8) ◽

pp. 1872-1877 ◽

Cited By ~ 2

Author(s):

Xiao Feng Zhang

Keyword(s):

Electron Microscopy ◽

Thin Films ◽

Large Angle ◽

High Resolution Electron Microscopy ◽

Superconducting Thin Films ◽

Superconducting Transition ◽

Secondary Phases ◽

Post Annealing ◽

Resolution Electron ◽

Induced Defects

Defects in Bi2Sr2Can-1CunOy superconducting thin films annealed in an oxygen atmosphere are examined by high-resolution electron microscopy (HREM). In addition to the majority 2212 (n = 2) phase, subsequent slabs of other homologous phases with n values up to n = 10 are found intergrown in the films. Large-angle tilt grain boundaries and various secondary phases such as CuO, Sr-Cu-O oxides are formed in the films. The occurrence of these defects is attributed to an inhomogeneous Sr, Ca, and Cu distribution induced by the post-annealing. Superconducting transition temperature (Tc) is increased by the annealing under suitable conditions.

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Tailored High-Tc Superconducting Thin Films Prepared by Layer-By-Layer Deposition with Excimer Laser

MRS Proceedings ◽

10.1557/proc-169-533 ◽

1989 ◽

Vol 169 ◽

Cited By ~ 1

Author(s):

Tomoji Kawai ◽

Masaki Kanai ◽

Hitoshi Tabata ◽

Shichio Kawai

Keyword(s):

Thin Films ◽

Laser Ablation ◽

Excimer Laser ◽

Weak Interaction ◽

Superconducting Thin Films ◽

Layer By Layer ◽

Deposition Method ◽

High Tc ◽

Excimer Laser Ablation ◽

Layer Deposition

AbstractBy using 1ayer-by-1ayer successive deposition method with excimer laser ablation, the distance between CuO2 planes in the Bi2Sr2Ca1Cu2Oy superconductor has been controlled and super lattices with concentration modulation of Y and Ca have been formed. From the properties of these ‘Tailored films’, it is suggested that there is an interaction between CuO2 layers across Ca layer to affect the Tc value, but there is a very weak interaction across Bi2O2 blocking layers.

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