Ru valence in RuSr2Gd2-xCexCu2O10+Φ as measured by x-ray-absorption near-edge spectroscopy
Ru valence in RuSr2Gd2-xCexCu2O10+Φ as measured by x-ray-absorption near-edge spectroscopy
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通过 X 射线吸收近边光谱测量 RuSr2Gd2-xCexCu2O10+Φ 中的 Ru 价态
DOI：
10.1103/physrevb.65.064508
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
R. Liu
中科院分区：
文献类型：
--
作者：
G. Williams;L. Jang;R. Liu
本文报道了RuSr2Gd2xCexCu2O10 + Φ的X射线吸收近边光谱、电阻和热电势测量结果。该化合物具有超导电性和铁磁有序性共存的特点。此外，随着Ce浓度的增加，磁化强度的温度依赖性有系统的变化。然而，我们发现，从我们的研究中，Ru的平均价为4.95′0.05与Ce浓度无关。这意味着没有电荷转移到RuO2层与增加Ce浓度。在0.6 ≤ x ≤ 0.8范围内，超导转变温度几乎不变，这表明即使Ce 4 +使空穴浓度降低0.1，也没有明显的电荷转移到CuO2面。空穴浓度的降低可能通过氧含量δ的增加来补偿。
We report the results from x-ray-absorption near-edge spectroscopy, electrical resistance, and thermopower measurements on RuSr 2 Gd 2 x Ce x Cu 2 O 1 0 + Φ . This compound displays the coexistence of superconductivity and ferromagnetic order. Furthermore, there are systematic changes in the temperature dependence of the magnetization with increasing Ce concentration. However, we find from our study that the average Ru valence is 4.95′0.05 irrespective of the Ce concentration. This implies that there is no charge transfer to the RuO 2 layer with increasing Ce concentration. The nearly constant superconducting transition temperature for 0.6 ≤ x ≤ 0.8 indicates that there is also no significant charge transfer to the CuO 2 planes even though Ce 4 + is expected to decrease the hole concentration by 0.1. It is possible that the decrease in the hole concentration is compensated for by an increase in the oxygen content δ.