Enhanced J{sub c} and improved grain-boundary properties in Ag-doped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.119452· OSTI ID:531713

Selvam, P ^[1]; Seibt, E W ^[2]; Kumar, D; Pinto, R; Apte, P R ^[3]

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1. Department of Chemistry, Indian Institute of Technology, Powai, Bombay 400 076 (India)
2. Institut fuer Technische Physik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe (Germany)
3. Tata Institute of Fundamental Research, Colaba, Bombay 400 005 (India)

A large increase ({approximately}8{times}) in critical current density, J{sub c}, was achieved for {ital in situ} laser ablated YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}{endash}Ag films. High-resolution Auger electron spectroscopic investigation indicates that the Ag-doped films are stoichiometric with a relatively low grain-boundary extension (8 nm) in contrast to undoped YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films (32 nm). Further analysis suggests that the doped film contains a much lower silver content ({lt}0.15wt{percent}) than in the target material (5 wt{percent}). These observations are in excellent agreement with the temperature dependence of J{sub c}, the room-temperature resistivity, and the surface resistance results. Thus, J{sub c} enhancement in Ag-doped films can be attributed to their superior properties, viz., improved microstructure characteristics and the reduced resistive grain boundaries. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 531713
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 1 Vol. 71; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUGER EFFECT
BARIUM COMPOUNDS
BARIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL DOPING
ELECTRIC CONDUCTIVITY
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
MICROSTRUCTURE
SILVER
SILVER ADDITIONS
STOICHIOMETRY
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES