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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 63
times in current journal articles indexed in the ISI database during
March-April 2002. As has been the case for the last several two-month tallies,
this report emerges after the March-April count as the most-cited physics
paper published in the last two years (excluding reviews). Prior to the most
recent bimonthly count, citations have accrued as follows:
January-February 2002: 48 citations
November-December 2001: 78
September-October 2001: 63
July-August 2001: 54
May-June 2001: 35
March-April 2001: 10
Total citations to date: 351
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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