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Yb valence change in Ce_(1-x)Yb-xCoIn_5 from spectroscopy and bulk properties

机译:Ce_(1-x)Yb-xCoIn_5的Yb价变化从光谱学和本体性质

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摘要

The electronic structure of Ce-(1-x)Yb-xCoIn-5 has been studied by a combination of photoemission, x-ray absorption, and bulk property measurements. Previous findings of a Ce valence near 3+ for all x and of an Yb valence near 2.3+ for x ≥ 0.3 were confirmed. One new result of this study is that the Yb valence for x ≤ 0.2 increases rapidly with decreasing x from 2.3 toward 3+, which correlates well with de Haas van Alphen results showing a change of Fermi surface around x =0.2. Another new result is the direct observation by angle resolved photoemission Fermi surface maps of ≈50% cross-sectional area reductions of the α and β sheets for x = 1 compared to x =0, and a smaller, essentially proportionate, size change of the α sheet for x = 0.2. These changes are found to be in good general agreement with expectations from simple electron counting. The implications of these results for the unusual robustness of superconductivity and Kondo coherence with increasing x in this alloy system are discussed.
机译:Ce-(1-x)Yb-xCoIn-5的电子结构已通过光发射,x射线吸收和体性质测量的组合进行了研究。先前发现所有x的Ce价均接近3 +,x≥0.3的Yb价接近2.3+。这项研究的一个新结果是x≤0.2的Yb价随着x从2.3朝3+的减小而迅速增加,这与de Haas van Alphen结果显示出x = 0.2附近费米表面的变化有很好的相关性。另一个新结果是通过角度分辨的光发射费米表面图直接观察到x和x = 1时,α和β薄片的横截面积减少了≈50%,而x = 0时,α和β薄片的尺寸变化较小,基本上成比例x = 0.2时的α张。发现这些变化与简单电子计数的预期总体上吻合良好。讨论了这些结果对于在该合金体系中超导电性和Kondo相干性随x的增加具有非凡的鲁棒性的含义。

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  • 来源
    《Physical review》 |2013年第16期|165118.1-165118.14|共14页
  • 作者单位

    Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1040, USA,Physikalisches Institut und Roentgen Center for Complex Materials Systems, Universitaet Wuerzburg, 97074 Wuerzburg, Germany;

    Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94270, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA,State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People's Republic of China;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA,Condensed Matter and Magnet Science group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1040, USA;

    Department of Physics, University of California, San Diego, La Jolla, California 92093, USA;

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  • 正文语种 eng
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  • 关键词

    fermi surface: calculations and measurements; effective mass, G factor; alkali and alkaline earth metals; strongly correlated electron systems; heavy fermions;

    机译:费米表面:计算和测量;有效质量;G因子;碱金属和碱土金属;强相关电子系统;重费米子;

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