Metallic Weak-Link Character of Grain Boundaries in High-Tc Materials
The intrinsic current-voltage characteristics (CVC) of high-Tc materials are analysed in the frame of a recent microscopic theory of metallic (nontunnelling) Josephson junctions, suitable for SNS systems. The comparison of the theoretical model with experimental CVC of grain boundaries shows that those intrinsic juntions exhibit the essential features of metallic weak links and definitely do not act as tunnelling junctions. As a consequence, the grain boundaries are also responsible for the presence of intrinsic normal electrons in the superconducting state of high-Tc superconductors.
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