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Week of April 12, 2009 < Back ¦ 2009 ¦ Home

Hot Paper in Physics

"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 Analytics 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:

September-October 2008: 43 citations
July-August 2008: 15

Total citations to date: 113

SOURCE: Hot Papers Database (Included with a subscription to the print newsletter Science Watch®, available from the Research Services Group of Thomson Reuters. Packaged on a CD that is mailed with each Science Watch issue, the Hot Papers Database contains 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. An updated CD containing the most recent bimonthly data is mailed with every new issue of Science Watch, six times a year. The CD also includes an electronic version of the Science Watch issue in HTML format, for personal desktop access.

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