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首页> 外文会议>Symposium on Actinides - Basic Science, Applications and Technology; 20031201-20031203; Boston,MA; US >Am Doping in Copper-Oxide Superconducting Systems
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Am Doping in Copper-Oxide Superconducting Systems

机译：氧化铜超导系统中的Am掺杂

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摘要

The effect of Am doping on the physical properties of three superconducting systems (RBa_2Cu_3O_7, Pb_2Sr_2R_(1-x)Ca_xCu_3O_8 and R_(2-x)M_xCuO_4) have been studied using x-ray diffraction, x-ray absorption spectroscopy (XAS) and magnetic susceptibility experiments. Am is incorporated into all three systems as the tetravalent ion and superconductivity is not observed in any of the resultant compounds. The absence of superconductivity in Pb_2Sr_2Am_(0.5)Ca_(0.5)Cu_3O_8 is attributed to the transfer of charge from Am to the Cu-O planes. Systems that cannot incorporate a tetravalent ion, notably AmBa_2Cu_3O_7 and Am_2CuO_4, do not form. Although Pr_(1.85)Am_(0.15)CuO_4 forms with similar structure to Pr_(1.85)Ce_(0.15)CuO_4, and Am like Ce is tetravalent, it is not superconducting. We argue that the absence of superconductivity in the Am doped Pr compound it is due to the hybridization of radially-extended f orbitals on the magnetic Am~(4+) ion with the Cu-O band states.
机译：使用X射线衍射，X射线吸收光谱法（XAS）和磁化率实验。 Am被并入所有三个系统中，因为四价离子均未发现超导性。 Pb_2Sr_2Am_（0.5）Ca_（0.5）Cu_3O_8中没有超导性是由于电荷从Am转移到Cu-O平面。无法形成不能结合四价离子的系统，特别是AmBa_2Cu_3O_7和Am_2CuO_4。 Pr_（1.85）Am_（0.15）CuO_4的形成与Pr_（1.85）Ce_（0.15）CuO_4具有相似的结构，并且Ce类似Ce是四价的，但它不是超导的。我们认为，在Am掺杂的Pr化合物中不存在超导性，这是由于在径向Am-（4+）离子上具有Cu-O能带态的径向扩展的f轨道的杂化。

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