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首页> 外文期刊>Physical review >Simultaneous valence shift of Pr and Tb ions at the spin-state transition in (Pr_(1-y)Tb_y)_(0.7)Ca_(0.3)CoO_3
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Simultaneous valence shift of Pr and Tb ions at the spin-state transition in (Pr_(1-y)Tb_y)_(0.7)Ca_(0.3)CoO_3

机译：（Pr_（1-y）Tb_y）_（0.7）Ca_（0.3）CoO_3的自旋态跃迁中Pr和Tb离子的同时化合价

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摘要

Temperature dependence of the x-ray absorption near-edge structure (XANES) spectra at the Pr L_3 and Tb L_3 edges was measured for the (Pr_(1-y)Tb_y)_(0.7)Ca_(0.3)CoO_3 system, in which a sharp spin-state (SS) transition took place at a critical temperature T_(SS). A small increase in the valence of the terbium ion was found below T_(SS), besides the enhancement of the praseodymium valence; the trivalent states, which are stable at room temperature, change to a 3 + /4 + ionic mixture at low temperatures. In particular for the y = 0.2 sample, the average valence determined at 8 K amounts to 3.25 + and 3.03 + for the Pr and Tb ion, respectively. In analogous (Pr_(1-y)RE_y)_(0.7)Ca_(0.3)CoO_3 samples (RE = Sm and Eu), in which the SS transition also took place, no valence shift of the RE ion was detected in the XANES spectra at the RE ion L_3 edge. The role of the substituted RE ion for the Pr site on the SS transition is discussed.
机译：对于（Pr_（1-y）Tb_y）_（0.7）Ca_（0.3）CoO_3系统，测量了Pr L_3和Tb L_3边缘处的x射线吸收近边缘结构（XANES）光谱的温度依赖性。在临界温度T_（SS）发生了急剧的自旋态（SS）转变。在T_（SS）以下，the离子的价数增加了一点，除了the价的增加。在室温下稳定的三价态在低温下变为3 + / 4 +离子混合物。特别是对于y = 0.2样品，在8 K下确定的Pr和Tb离子的平均化合价分别为3.25 +和3.03 +。在类似的（Pr_（1-y）RE_y）_（0.7）Ca_（0.3）CoO_3样品（RE = Sm和Eu）中，也发生了SS跃迁，在XANES中未检测到RE离子的价态变化RE离子L_3边缘的光谱。讨论了取代的RE离子对SS跃迁上Pr位点的作用。

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  • 来源
    《Physical review》 |2013年第15期|155153.1-155153.7|共7页
  • 作者

    H. Fujishiro; T. Naito; D. Takeda; N. Yoshida; T. Watanabe; K. Nitta; J. Hejtmanek; K. Knizek; Z. Jirak;

  • 作者单位

    Faculty of Engineering, Iwate University, 4-3-5 Ueda, Morioka 020-8551, Japan;

    Faculty of Engineering, Iwate University, 4-3-5 Ueda, Morioka 020-8551, Japan;

    Faculty of Engineering, Iwate University, 4-3-5 Ueda, Morioka 020-8551, Japan;

    Faculty of Engineering, Iwate University, 4-3-5 Ueda, Morioka 020-8551, Japan;

    Faculty of Engineering, Iwate University, 4-3-5 Ueda, Morioka 020-8551, Japan;

    Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan;

    Institute of Physics, ASCR, Cukrovarnicka 10, 162 00 Prague 6, Czech Republic;

    Institute of Physics, ASCR, Cukrovarnicka 10, 162 00 Prague 6, Czech Republic;

    Institute of Physics, ASCR, Cukrovarnicka 10, 162 00 Prague 6, Czech Republic;

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  • 正文语种 eng
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  • 关键词

    metal-insulator transitions and other electronic transitions; x-ray absorption spectra; spin crossover;

    机译：金属-绝缘体过渡和其他电子过渡;X射线吸收光谱;自旋交叉;

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