%0 Journal Article
%T Element Substitution Effect in Transition Metal Oxypnictide Re(O1-xFx)TAs (Re=rare earth, T=transition metal)<br>
%A CHEN Gen-Fu
%A LI Zheng
%A WU Dan
%A DONG Jing
%A LI Gang
%A HU Wan-Zheng
%A ZHENGPing
%A LUO Jian-Lin
%A WANG Nan-Lin
%A <br>
%J 中国物理快报
%D 2008
%I 
%X Different element substitution effects in transition metal oxypnictide Re(O1-xFx)TAs, with Re=La, Ce, Nd, Eu, Gd, Tm, T=Fe, Ni, Ru, are studied. Similarto the La- or Ce-based systems, we find that the pure NdOFeAs shows a strong resistivity anomaly near 145K, which is ascribed to the spin-density-wave instability. Electron doping by F increases Tc to about 50K. While in the case of Gd, Tc is reduced below 10K. The tetragonal ZrCuSiAs-type structure could not be formed for Eu or Tm substitution in our preparing process. For the Ni-based case, although both pure and F-doped LaONiAs are superconducting, no superconductivity is found when La is replaced by Ce in both the cases, instead a ferromagnetic ordering transition is likely to form at low temperature in the undoped sample. We also synthesize LaO1-xFxRuAs and CeO1-xFxRuAs compounds. The metallic behaviour is observed down to 4K.
%K 74
%K 70
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%K 70
%K -b
%K 74
%K 62
%K Bf
%K 74&prev_q=')"> 74" target="_blank">')"> 74
%K 25
%K Gz<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=E27DA92E19FE279A273627875A70D74D&aid=45D1F5FB0A210CC676F79336892606A0&yid=67289AFF6305E306&vid=C5154311167311FE&iid=B31275AF3241DB2D&sid=A546221D94E329E5&eid=AFE3019834729C2C&journal_id=0256-307X&journal_name=中国物理快报&referenced_num=0&reference_num=0