Interface pinning in high T{sub c}-high J{sub c} Nd{sub 1+x}Ba{sub 2{minus}x}Cu{sub 3}O{sub y} directionally solidified in air

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

DOI:https://doi.org/10.1063/1.119326· OSTI ID:526850

Yu, R; Sandiumenge, F; Martinez, B; Vilalta, N; Obradors, X ^[1]

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1. Institut de Ciencia de Materials de Barcelona, CSIC, Campus de la UAB, 08193 Bellaterra, Catalunya (Spain)

Single domain bars of NdBa{sub 2}Cu{sub 3}O{sub 7}/Nd{sub 4}Ba{sub 2}Cu{sub 2}O{sub 10} (Nd123/422) superconducting composites have been fabricated in air by using a directional solidification technique. T{sub c} values of 96.5 K can be obtained after an Ar heat treatment and further oxygenation thus showing that reduced oxygen partial pressure during solidification is not a fundamental requirement to prepare high-T{sub c} Nd123 bulk superconductors. The temperature dependence of the critical currents point to a limited efficiency of the Nd123/422 interfaces to pin vortices. High resolution electron microscopy observations clearly reveal smooth Nd123/422 interfaces thus suggesting that interface pinning may not be as relevant as compared to Y123/211 composites. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 526850
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 3 Vol. 71; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
BARIUM OXIDES
COMPOSITE MATERIALS
COPPER OXIDES
CRITICAL CURRENT
ELECTRON MICROSCOPY
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
INTERFACES
MAGNETIC FLUX
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDATION
SOLIDIFICATION
TRANSITION TEMPERATURE
TRANSMISSION ELECTRON MICROSCOPY