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Combinative energy between two structural blocks and superconductivity in LaFe_(1-x)Co_xAsO

【摘要】:正Polycrystalline samples of LaFe_(1-x)Co_xAsO were synthesized by solid-state reaction in vacuum and characterized by powder x-ray diffraction,Rietveld refinement and DC magnetic susceptibility measurement. Based on a block model and a program,the cohesive energy of the whole cell and the combinative energy between the Fe-As block and the La-0 block in LaFe_(1-x)Co_xAsO were calculated.A relationship between the combinative energy and Tc is established,which is similar to the previous reports in cuprate HTSCs to some extent. While the nearly unchanged combinative energy in LaFe_(1-x)CO_xAsO no matter whether the electron is supposed at the Fe,As site or at the centre of the Fe-As layer conforms an itinerant character in LaFe_(1-x)Co_xAsO,which is remarkably different from the local carrier picture in the cuprate HTSCs.The Charge-transfer models were suggested to explain the relationship.It hints something interesting to understand the similarity and difference in superconductivity mechanism of the two important HTSCs.

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