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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >X-ray spectroscopic study of the electronic structure of Y_(1-x)Pr_xBa_2Cu_3O_7
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X-ray spectroscopic study of the electronic structure of Y_(1-x)Pr_xBa_2Cu_3O_7

机译：Y_（1-x）Pr_xBa_2Cu_3O_7的电子结构的X射线光谱研究

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摘要

We present a detailed investigation of the bulk electronic properties of Y_(1-x)Pr_xBa_2Cu_3O_7 (YPrBCO) using x-ray absorption spectroscopy in the partial fluorescence yield mode (PFY-XAS) at Pr L_3, Ba L_3, and Cu K edges together with Pr 2p_(3/2)3d_(5/2) and Cu 1s2p resonant inelastic x-ray scatterings. Pr L_3 PFY-XAS spectra show that Pr is in the mixed-valence state (with the valence number slightly greater than 3) for the whole x =0.2-1 range, while the Pr valence decreases with increasing x. The decrease of the Pr~(4+) component upon Pr doping, hinting at a weakening Pr-O hybridization, is inconsistent with the scenario according to which the increase in Pr-O hybridization quenches the superconductivity in YPrBCO for x ≥ 0.6. It rather suggests that the superconductivity may be suppressed by the total increase of the Pr-related states in the electronic structure due to the Pr ion concentration upon doping. No doping dependence is found in the electronic structure of the Ba and Cu sites, consistent with their invariant environment. No temperature dependence in our data is observed within the experimental accuracy.
机译：我们目前使用X射线吸收光谱法在Pr L_3，Ba L_3和Cu K边沿的部分荧光屈服​​模式（PFY-XAS）中详细研究Y_（1-x）Pr_xBa_2Cu_3O_7（YPrBCO）的体电子性质Pr 2p_（3/2）3d_（5/2）和Cu 1s2p共振非弹性x射线散射。 Pr L_3 PFY-XAS光谱显示，在整个x = 0.2-1范围内，Pr处于混合价态（价数略大于3），而Pr价随x的增加而降低。 Pr掺杂后Pr〜（4+）组分的减少暗示了Pr-O杂交的减弱，这与以下情形不一致：Pr-O杂交的增加使x≥0.6的YPrBCO中的超导性淬灭。而是暗示由于掺杂时的Pr离子浓度，电子结构中的Pr相关态的总增加可以抑制超导电性。在Ba和Cu位点的电子结构中未发现掺杂依赖性，这与它们的不变环境一致。在实验精度范围内，我们的数据未发现温度依赖性。

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