"Iron-based layered superconductor La[O1-xFx]FeAs (x = -.05 - 0.12)
with Tc = 26 K," by Yoichi Kamihara, Takumi Watanabe, Masahiro
Hirano, and Hideo Hosono, Journal of the American Chemical
Society, 130(11): 3296-7, 19 March 2008.
[Authors' affiliation: Tokyo Institute of Technology, Yokohama, Japan]
From the introduction: "Discovery of the copper-based
superconductor La2-xBaxCuO4 with a high transition temperature (Tc)
triggered extensive research with the intention of developing new
transition-metal-based superconductors. Currently, high Tc superconductors
are limited to layered perovskites that contain CuO2 structural units as
the conduction layers. However, the Tc of the non-Cu-based superconductors
in this category has remained low, although spin triplet superconductivity
has been found in UPt3 (Tc ~ 0.64 K) and Sr2-RuO4 (Tc ~ 1.4 K). Here, we
report a layered iron-based compound, LaOFeAs, which undergoes
superconducting transition under doping with F- ions at the O2- site. Its
Tc exhibits a trapezoidal shape dependence on F- content, with the highest
Tc of ~26 K at 5-11 atoms %. Further, its magnetic susceptibility indicates
that F-doped LaOFeAs exhibits Curie-Weiss-like behavior in the normal
conducting state."
This 2008 report from the Journal of the American Chemical Society
was cited 108 times in current journal articles
indexed by Clarivate during January-February 2009. In fact, the paper
repeats, quite literally, its performance from the previous tally for
November-December 2008, both in terms of the citation count and the status
as the most-cited chemistry paper (aside from reviews) published in the
last two years--a streak that now extends to four consecutive bimonthly
periods. Prior to the latest two-month count, citations to the paper have
accrued as follows:
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