High-temperature superconducting objects of
Bi2Sr2CaCu2O8 and Y Ba2Cu3O7 highly curved in the ab-plane, such as
curved/kinked whiskers, bows and ring-like structures, were obtained within a
solid–liquid–solid (SLS) grass-like growth mechanism. As-grown objects are
crystals with three-dimensional epitaxy similar to conventional single
crystals: they can be viewed as crystal parts 'cut' from a conventional
rectangular crystal. Between our curved objects and conventional crystals,
whiskers or thin films there are some differences in the superconducting
properties induced only by the shape factors and no new physics is observed.
Some details of the growth mechanism are discussed, emphasizing curved-line
formation.
Source:IOPscience
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