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Lower <i>T</i> <i>c</i> barriers at high angle boundaries in the (BiPb)2Sr2Ca2Cu3O<i>x</i> system
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1995
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Materials ScienceTransition Metal ChalcogenidesCompositional Variable BoundariesHigh-tc SuperconductivityEngineeringPhysicsApplied PhysicsSuperconductivityQuantum MaterialsCondensed Matter PhysicsHigh Tc SuperconductorsWeak LinkHigh Angle BoundariesCrystallography
The structure of high angle boundaries in the (BiPb)2Sr2Ca2Cu3Ox system, which is compositional and structurally modulated along the boundaries, was investigated by high resolution electron microscopy. These compositional variable boundaries tend to facet onto the (001) plane, leaving steps of height equal c/2 for the (BiPb)2Sr2CuOx and (BiPb)2Sr2Ca1Cu2Ox phases with amorphous material at the corners of these steps. These data suggest a weak link is formed at high angle boundaries where there are such lower Tc or insulating phases.