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"Superconductivity at 39K in
magnesium diboride," by Jun
Nagamatsu, Norimasa Nakagawa, Takahiro Muranaka, Yuji Zenitani, and Jun
Akimitsu, Nature, 410(6824): 63-4, 1 March 2001.
[Authors' affiliations: Aoyama-Gakuin
University, Tokyo, Japan; CREST, Japan Science and Technology Corporation,
Saitama, Japan]
Abstract: "In the light of the
tremendous progress that has been made in raising the transition temperature
of the copper oxide superconductors, it is natural to wonder how high the
transition temperature, Tc, can be pushed in other classes of materials. At
present, the highest reported values of Tc for non-copper-oxide bulk
superconductivity are 33 K in electron-doped CsxRbyC60, and 30 K in
Ba1-xKxBiO3. (Hole-doped C60 was recently found to be superconducting with a
Tc as high as 52 K, although the nature of the experiment meant that the
supercurrents were confined to the surface of the C60 crystal, rather than
probing the bulk.) Here we report the discovery of bulk superconductivity in
magnesium diboride, MgB2. Magnetization and resistivity measurements establish
a transition temperature of 39 K, which we believe to be the highest yet
determined for a non-copper-oxide bulk superconductor."
This 2001 Nature report was cited 47
times in current journal articles indexed in the ISI database during
July-August 2002. As has been the case for several bimonthly counts in a row
now, this is currently the most-cited paper in physics published in the last
two years, save for reviews. Prior to the most recent bimonthly count,
citations to the paper have accrued as follows:
May-June 2002: 64 citations
March-April 2002: 63
January-February 2002: 48
November-December 2001: 78
September-October 2001: 63
July-August 2001: 54
May-June 2001: 35
March-April 2001: 10
Total citations to date: 462
SOURCE: Hot
Papers Database (Included with a subscription to the ISI print newsletter Science
Watch®, available from the ISI
Research Services Group. Packaged on a CD-ROM that is mailed with each Science
Watch issue, the Hot
Papers Database contains data on hundreds of highly cited papers published
during the last two years. User interface permits searching by author,
organization, journal, field, and more. Total citations, as well as citations
accrued during successive bimonthly periods, can be assessed and graphed. An
updated CD containing the most recent bimonthly data is mailed with every new
issue of Science
Watch,
six times a year. The CD also includes an electronic version of the Science
Watch
issue in HTML format, for personal desktop access.)
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