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Element Substitution Effect in Transition Metal Oxypnictide Re(O1-xFx)TAs (Re=rare earth, T=transition metal) |
CHEN Gen-Fu;LI Zheng;WU Dan;DONG Jing;LI Gang;HU Wan-Zheng;ZHENG
Ping;LUO Jian-Lin;WANG Nan-Lin |
| Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 |
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| Cite this article: |
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CHEN Gen-Fu, LI Zheng, WU Dan et al 2008 Chin. Phys. Lett. 25 2235-2238 |
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Abstract 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. Similar
to 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.
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| Keywords:
74.70.-b
74.62.Bf
74.25.Gz
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Received: 06 May 2008
Published: 31 May 2008
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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74.25.Gz
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(Optical properties)
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