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The field of high-temperature superconductivity has encouraged an
inter disciplinary approach to research. It has required
significant cooperation and collaboration among researchers, each
of whom has brought to it a rich variety of experience from many
other fields. Recently, great improvements have been made in the
quality of research. The subject has matured and been launched into
the next stage through the resonance between science and
technology. The current progress of materials processing and
engineering in this field is analogous to that previously seen in
the development of semiconductors. These include the appearance of
materials taking the place of YBa2Cu307 owing to their improved
properties (higher critical temperatures and stronger flux pin
ning) in which rare earth ions with large radii (La, Nd, Sm)
substitute for Y; the development of technology enabling growth
control on the nanometer scale; and precise and reproducible
measurements that can be used as rigorous tests of theoretical
models, which in turn are expected to lead to the develop ment of
new devices. For further progress in high-T research, academics and
c technologists must pool their knowledge and experience. I hope
that this volume will promote that goal by providing the reader
with the latest results of high-temperature superconductor research
and will stimulate further discussion and collaboration.
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