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Science 27 September 1996:
Vol. 273. no. 5283, pp. 1836 - 1840
DOI: 10.1126/science.273.5283.1836
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Reports
Nanorod-Superconductor Composites: A Pathway to Materials with
High Critical Current Densities
Peidong Yang
and
Charles M. Lieber
*
Most large-scale applications of the high-temperature copper oxide
superconductors (HTSCs) require high critical current densities
(Jc's) at temperatures near the boiling point
of liquid nitrogen to be technologically useful, although thermally
activated flux flow reduces Jc dramatically at
these temperatures. This intrinsic limitation can be overcome by
introducing nanometer-sized columnar defects into an HTSC. Nanorods of
magnesium oxide were grown and incorporated into HTSCs to form
nanorod-HTSC composites. In this way, a high density of nanorod
columnar defects can be created with orientations perpendicular and
parallel to the copper oxide planes. The Jc's
of the nanorod-HTSC composites are enhanced dramatically at high
temperatures and magnetic fields as compared with reference samples;
these composites may thus represent a technologically viable strategy
for overcoming thermally activated flux flow in large-scale
applications.
P. Yang, Department of Chemistry, Harvard University, Cambridge,
MA 02138, USA.
C. M. Lieber, Division of Applied Sciences and Department of Chemistry,
Harvard University, Cambridge, MA 02138, USA.
*
To whom correspondence should be addressed.
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