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Week of January 10, 2010 < Back ¦ 2010 ¦ Home

Hot Paper in Chemistry

"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 109 times in current journal articles indexed by Clarivate Analytics during September-October 2009. For what is now the eight consecutive bimonthly period, the report scores as the most-cited chemistry paper published in the last two years, excluding reviews. Prior to the most recent two-month tally, citations to the paper have accrued as follows:

July-August 2009: 173 citations
May-June 2009: 124
March-April 2009: 142
January-February 2009: 108
November-December 2008: 108
September-October 2008: 92
July-August 2008: 62
May-June 2008: 20
March-April 2008: 1

Total citations to date: 939

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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