Abstract
The high temperature superconductors form natural superconducting multilayers where adjacent superconducting layers are weakly coupled by the Josephson effect. As a consequence, single crystals act intrinsically as vertical stacks of Josephson junctions. At present, intrinsic Josephson junctions are fabricated and investigated by several groups. There has been considerable progress both in production of high quality junctions and in theoretical understanding of the intrinsic Josephson effect. In this paper the basic physics of intrinsic Josephson junctions is outlined. Some examples of the present status of research are given.
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