The ups and downs of doping (Aug 11)
http://physicsweb.org/article/news/9/8/8
Finding a theory that explains high-temperature superconductivity in
cuprate materials is one of the outstanding challenges in
condensed-matter physics. Now a team of physicists in the US and Japan
has observed a new effect that could help in the search for such a
theory. Cuprate materials are normally insulators but they become
superconductors when dopant atoms are added. However, Seamus Davis of
Cornell University and colleagues have found evidence which suggests
that these dopant atoms can also lead to electronic disorder that
damages the superconducting properties of the cuprates (Science 309
1048).
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