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Title: Improvement in the properties of high T sub c films fabricated in situ by laser ablation of YBa sub 2 Cu sub 3 O sub 7 -Ag targets

Abstract

We have studied the microstructural and superconducting properties of YBa{sub 2}Cu{sub 3}O{sub 7} films fabricated by pulsed laser evaporation of YBa{sub 2}Cu{sub 3}O{sub 7}-Ag targets, containing approximately 30% by weight of silver. The films produced by excimer laser evaporation/ablation of YBa{sub 2}Cu{sub 3}O{sub 7}-Ag targets were found to possess better superconducting and microstructural properties than films prepared under the same conditions from bulk YBa{sub 2}Cu{sub 3}O{sub 7} targets. YBa{sub 2}Cu{sub 3}O{sub 7} films deposited on yttria stabilized zirconia (YSZ) substrates from YBa{sub 2}Cu{sub 3}O{sub 7}-Ag targets at 650 {degree}C showed helium ion channeling yields of approximately 9%--12%, while films deposited from YBa{sub 2}Cu{sub 3}O{sub 7} targets had channeling yields in the range of 18%--25%. The critical current density of YBa{sub 2}Cu{sub 3}O{sub 7}Ag{sub {ital x} }films on YSZ substrates had values of approximately 1.8{times}10{sup 6} A/cm{sup 2} at 77 K which corresponds to approximately an 80% improvement from the values obtained from films deposited from cold pressed YBa{sub 2}Cu{sub 3}O{sub 7} targets. Based on the structural and chemical information, it appears that two effects play a major role in improving the superconducting properties of laser ablated thin films made from silver composite superconductor targets (i) improved evaporation characteristics of themore » targets due to silver incorporation and (ii) the catalyst effect of silver in stabilizing the superconducting phase and enhancing grain growth.« less

Authors:
;  [1]; ;  [2];  [3]
  1. Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611-2066 (United States)
  2. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695-7916 (United States)
  3. Department of Electrical Engineering, North Carolina A T State University, Greensboro, North Carolina 27411 (United States)
Publication Date:
OSTI Identifier:
5526984
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters; (United States)
Additional Journal Information:
Journal Volume: 60:2; Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM OXIDES; CRITICAL CURRENT; CRYSTAL GROWTH; CUPRATES; YTTRIUM OXIDES; CATALYTIC EFFECTS; CURRENT DENSITY; HIGH-TC SUPERCONDUCTORS; LASER-PRODUCED PLASMA; MICROSTRUCTURE; SILVER ADDITIONS; SUPERCONDUCTIVITY; ALKALINE EARTH METAL COMPOUNDS; ALLOYS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; CRYSTAL STRUCTURE; CURRENTS; ELECTRIC CONDUCTIVITY; ELECTRIC CURRENTS; ELECTRICAL PROPERTIES; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; PLASMA; SILVER ALLOYS; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 360207 - Ceramics, Cermets, & Refractories- Superconducting Properties- (1992-)

Citation Formats

Singh, R K, Bhattacharya, D, Tiwari, P, Narayan, J, and Lee, C B. Improvement in the properties of high T sub c films fabricated in situ by laser ablation of YBa sub 2 Cu sub 3 O sub 7 -Ag targets. United States: N. p., 1992. Web. doi:10.1063/1.106954.
Singh, R K, Bhattacharya, D, Tiwari, P, Narayan, J, & Lee, C B. Improvement in the properties of high T sub c films fabricated in situ by laser ablation of YBa sub 2 Cu sub 3 O sub 7 -Ag targets. United States. https://doi.org/10.1063/1.106954
Singh, R K, Bhattacharya, D, Tiwari, P, Narayan, J, and Lee, C B. Mon . "Improvement in the properties of high T sub c films fabricated in situ by laser ablation of YBa sub 2 Cu sub 3 O sub 7 -Ag targets". United States. https://doi.org/10.1063/1.106954.
@article{osti_5526984,
title = {Improvement in the properties of high T sub c films fabricated in situ by laser ablation of YBa sub 2 Cu sub 3 O sub 7 -Ag targets},
author = {Singh, R K and Bhattacharya, D and Tiwari, P and Narayan, J and Lee, C B},
abstractNote = {We have studied the microstructural and superconducting properties of YBa{sub 2}Cu{sub 3}O{sub 7} films fabricated by pulsed laser evaporation of YBa{sub 2}Cu{sub 3}O{sub 7}-Ag targets, containing approximately 30% by weight of silver. The films produced by excimer laser evaporation/ablation of YBa{sub 2}Cu{sub 3}O{sub 7}-Ag targets were found to possess better superconducting and microstructural properties than films prepared under the same conditions from bulk YBa{sub 2}Cu{sub 3}O{sub 7} targets. YBa{sub 2}Cu{sub 3}O{sub 7} films deposited on yttria stabilized zirconia (YSZ) substrates from YBa{sub 2}Cu{sub 3}O{sub 7}-Ag targets at 650 {degree}C showed helium ion channeling yields of approximately 9%--12%, while films deposited from YBa{sub 2}Cu{sub 3}O{sub 7} targets had channeling yields in the range of 18%--25%. The critical current density of YBa{sub 2}Cu{sub 3}O{sub 7}Ag{sub {ital x} }films on YSZ substrates had values of approximately 1.8{times}10{sup 6} A/cm{sup 2} at 77 K which corresponds to approximately an 80% improvement from the values obtained from films deposited from cold pressed YBa{sub 2}Cu{sub 3}O{sub 7} targets. Based on the structural and chemical information, it appears that two effects play a major role in improving the superconducting properties of laser ablated thin films made from silver composite superconductor targets (i) improved evaporation characteristics of the targets due to silver incorporation and (ii) the catalyst effect of silver in stabilizing the superconducting phase and enhancing grain growth.},
doi = {10.1063/1.106954},
url = {https://www.osti.gov/biblio/5526984}, journal = {Applied Physics Letters; (United States)},
issn = {0003-6951},
number = ,
volume = 60:2,
place = {United States},
year = {1992},
month = {1}
}