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首页> 外文期刊>Physical review >Electron sampling depth and saturation effects in perovskite films investigated by soft x-ray absorption spectroscopy
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Electron sampling depth and saturation effects in perovskite films investigated by soft x-ray absorption spectroscopy

机译：软X射线吸收光谱法研究钙钛矿膜中电子的采样深度和饱和效应

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摘要

Knowledge of the electron sampling depth is important for quantitative analysis of x-ray absorption spectroscopy data, yet for oxides with the perovskite structure no quantitative values are so far available. Here, we study absorption saturation in films of two of the most-studied perovskites, La_(0.7)Ca_(0.3)MnO_3 (LCMO) and YBa_2Cu_3O_7 (YBCO), at the L_(2,3) edges of Mn and Cu, respectively. By measuring the electron-yield intensity as a function of photon incidence angle and film thickness, the sampling depth d, photon attenuation length λ, and ratio λ/d have been independently determined between 50 and 300 K. The extracted sampling depth d_(LCMO) ≈ 3 nm for LCMO films at high temperatures in the polaronic insulator state (150-300 K) is near the values reported for some transition metals (d_X = 1 -7-2.5 nm, where X = Fe, Co, Ni) at room temperature, and it is much smaller than d_(YBCO) ≈ 5 nm measured for YBCO films and the value previously reported for Fe_3O_4 (d_(Fe3O4) = 4.5 nm). The measured d_(LCMO) increases to 4.5 nm when LCMO is in the metallic state at low temperatures. These results indicate that the sampling depth in oxides is strongly material dependent and can be measurably influenced by electronic phase transitions deriving from strong correlations.
机译：电子采样深度的知识对于X射线吸收光谱数据的定量分析很重要，但是对于具有钙钛矿结构的氧化物，到目前为止尚无定量值。在这里，我们研究了两种研究最多的钙钛矿膜La_（0.7）Ca_（0.3）MnO_3（LCMO）和YBa_2Cu_3O_7（YBCO）的膜中的吸收饱和，分别位于Mn和Cu的L_（2,3）边缘。 。通过测量作为光子入射角和薄膜厚度的函数的电子屈服强度，可以分别确定采样深度d，光子衰减长度λ和比率λ/ d在50和300 K之间。提取的采样深度d_（LCMO ）在极化子绝缘子状态（150-300 K）的高温下，LCMO薄膜的≈3 nm接近于某些过渡金属（d_X = 1 -7-2.5 nm，其中X = Fe，Co，Ni）的报道值在室温下，它远小于YBCO膜测得的d_（YBCO）≈5 nm和先前报道的Fe_3O_4的值（d_（Fe3O4）= 4.5 nm）。当LCMO在低温下处于金属状态时，测得的d_（LCMO）增加到4.5 nm。这些结果表明，氧化物中的采样深度与材料密切相关，并且可以受到源自强相关性的电子相变的可测量影响。

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  • 来源
    《Physical review》 |2014年第12期|125120.1-125120.8|共8页
  • 作者

    A. Ruosi; C. Raisch; A. Verna; R. Werner; B. A. Davidson; J. Fujii; R. Kleiner; D. Koelle;

  • 作者单位

    Department of Physics, University of Naples 'Federico Ⅱ,' P. Tecchio 80, 80125 Naples, Italy;

    Physikalische Chemie and Center for Light Matter Interaction, Sensors and Analytics (LISA~+), Universitat Tuebingen,72076 Tuebingen, Germany;

    Consiglio Nazionale delle Ricerche-Istituto Officina dei Materiali (CNR-IOM), TASC National Laboratory, AREA Science Park,34012 Basovizza, Trieste, Italy;

    Physikalisches Institut and Center for Collective Quantum Phenomena in LISA~+, Universitaet Tuebingen, 72076 Tuebingen, Germany;

    Consiglio Nazionale delle Ricerche-Istituto Officina dei Materiali (CNR-IOM), TASC National Laboratory, AREA Science Park,34012 Basovizza, Trieste, Italy;

    Consiglio Nazionale delle Ricerche-Istituto Officina dei Materiali (CNR-IOM), TASC National Laboratory, AREA Science Park,34012 Basovizza, Trieste, Italy;

    Physikalisches Institut and Center for Collective Quantum Phenomena in LISA~+, Universitaet Tuebingen, 72076 Tuebingen, Germany;

    Physikalisches Institut and Center for Collective Quantum Phenomena in LISA~+, Universitaet Tuebingen, 72076 Tuebingen, Germany;

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  • 关键词

    X-ray absorption spectra; oxide surfaces; manganites; cuprate superconductors (high-Tc and insulating parent compounds);

    机译：X射线吸收光谱;氧化物表面锰矿;铜酸盐超导体（高Tc和绝缘母体化合物）;

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