"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 142 times in current journal articles
indexed by Clarivate during March-April 2009. With that latest
two-month tally, the paper's run as the most-cited chemistry report
published in the last two years (excluding reviews) now extends to five
consecutive bimonthly periods. Prior to the most recent count, citations to
the paper have accrued as follows:
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