"Superconductivity at 43 K in SmFeAsO(1-x)F(x)," by X.H.
Chen and 5 others, Nature, 453(7196): 761-2, 5 June 2008.
[Authors' affiliation: University of Science and Technology, Hefei, China]
Abstract: "Since the discovery of
high-transition-temperature (high-Tc) superconductivity in layered copper
oxides, extensive effort has been devoted to exploring the origins of this
phenomenon. A Tc higher than 40 K (about the theoretical maximum predicted
from Bardeen-Cooper-Schrieffer theory, however, has been obtained only in
the copper oxide superconductors. The highest reported value for
non-copper-oxide bulk superconductivity is Tc = 39 K in MgB2. The layered
rare-earth metal oxypnictides LnOFeAs (where Ln is La-Nd, Sm and Gd) are
now attracting attention following the discovery of superconductivity at 26
K in the iron-based LaO1-xFxFeAs. Here we report the discovery of bulk
superconductivity in the related compound SmFeAsO1-xFx, which has a
ZrCuSiAs-type structure. Resistivity and magnetization measurements reveal
a transition temperature as high as 43 K. This provides a new material base
for studying the origin of high-temperature superconductivity."
This 2008 report from Nature was cited 55
times in current journal articles indexed by Clarivate
during November-December 2008. As in the previous count for
September-October, this report emerges as the second-most-cited physics
paper published in the last two years, excluding reviews. (Papers on
iron-based superconductors, as was noted last time, have also found their
way onto the current Hot Papers chemistry list.) Prior to the most recent
bimonthly count, citations to the paper have accrued as follows:
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