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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 Nature report from early 2001 was
cited 83 times in current journal articles indexed in the ISI
database during November-December 2001. No other paper published in physics in
the last two years, aside from reviews, attracted as many citations during
that two-month period. The report, in fact, ranks among the most-cited papers
published in 2001. Prior to the most recent bimonthly count, citations have
accrued as follows:
September-October 2001: 48 citations
July-August 2001: 55
May-June 2001: 22
March-April 2001: 6
Total citations to date: 214
SOURCE: Hot
Papers Database (Available from the ISI
Research Services Group in a CD-ROM version containing 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. Database is
combined with subscription to the ISI newsletter Science
Watch®; updated discs containing the
most recent bimonthly data are mailed with each new issue, six times a
year.)
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