Boron local density of states of Y(Rh/sub 1-x/Ru/sub x/)/sub 4/B/sub 4/ superconductors
Boron local density of states of Y(Rh/sub 1-x/Ru/sub x/)/sub 4/B/sub 4/ superconductors
复制标题
Y(Rh/sub 1-x/Ru/sub x/)/sub 4/B/sub 4/超导体的硼局域态密度
DOI：
10.1103/physrevb.27.6713
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发表时间：
1983
期刊：
影响因子：
--
通讯作者：
S. Bader
中科院分区：
文献类型：
--
作者：
H. Hamaker;G. Zajac;S. Bader
用B KVV俄歇线形分析方法，结合X射线和紫外光电子能谱实验以及电子能量损失实验，研究了Y（Rh/sub 1-x/Ru/sub x/）/sub 4/B/sub 4/超导体（x = 0.15，0.50和0.85）在硼位的局域电子态密度（DOS）.动机是测试约翰斯顿的模型，其中超导转变温度的异常急剧下降x>或约。=0.5归因于突然的电荷转移到硼位点。实验俄歇线的形状进行了比较，我们已经产生的Jarlborg等人的能带结构计算的相关化合物YRh/sub 4/B/sub 4/。俄歇数据揭示了B局域态密度随x的连续演化，这不支持约翰斯顿模型。分析表明，B类p电子态和过渡金属类d电子态的杂化随x的变化是连续的。我们认为，这些变化在pd杂化可能与以前报道的晶格畸变，这个系统，这些影响直接影响电子-声子相互作用强度。
Local electronic density of states (DOS) at the boron site for Y(Rh/sub 1-x/Ru/sub x/)/sub 4/B/sub 4/ superconductors, with x = 0.15, 0.50, and 0.85, have been characterized by means of B KVV Auger line-shape analyses, with supporting data from x-ray- and ultraviolet-photoemission experiments and electron-energy-loss experiments. The motivation was to test Johnston's model, in which the unusually precipitous drop of the superconducting transition temperature for x> or approx. =0.5 is attributed to an abrupt charge transfer to the boron site. Comparisons of the experimental Auger line shapes are made to those we have generated from band-structure calculations by Jarlborg et al. for the related compound YRh/sub 4/B/sub 4/. The Auger data reveal a continuous evolution of the B local DOS with x, which does not support the Johnston model. The analyses indicate that there is a continuous modification of the hybridization of the B p-like and the transition-metal d-like electronic states with x. We suggest that these changes in the pd hybridization may be related to a previously reported lattice distortion for this system, and that these effects directly influence the electron-phonon interaction strength.