"Iron-based layered superconductor La[O1-xFx]FeAs (x = -.05 - 0.12)
with Tc = 26 K," 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 November-December
2008. For the third consecutive bimonthly period, this report scores as
the most-cited chemistry paper published in the last two years, aside
from reviews. In fact, of all non-review papers published during 2008,
in all fields, this one garnered the highest citation total by year's
end. Prior to the most recent bimonthly count, citations to the paper
have accrued as follows:
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