Densities of States of Paramagnetic Cu-Ni Alloys
Densities of States of Paramagnetic Cu-Ni Alloys
复制标题
顺磁铜镍合金的态密度
DOI：
10.1103/physrevb.4.4390
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发表时间：
1971
影响因子：
3.7
通讯作者：
J. Faulkner
中科院分区：
文献类型：
--
作者：
G. M. Stocks;R. G. Willams;J. Faulkner
近理想的替代随机合金系统Cu-Ni的状态密度计算使用相干势近似的浓度范围内的成分在整个合金图。它表明，以前的模型计算富Ni的顺磁性Cu-Ni合金使用的相干势近似可以扩展到任意浓度的合金，如果使用适当的Cu和Ni势函数。所获得的结果是一致的实验光电发射和软X-射线发射曲线，只要比较可以影响。结果表明，这种简单的随机合金理论在讨论这些合金的常规低温比热数据时存在局限性。对于富铜合金的结果对应于分裂带制度，而对于富镍合金的d带与铜和镍网站在合金中重叠到相当大的程度。对于所有的Cu-Ni合金，刚性带模型和虚晶近似都是不合适的。
The densities of states of the near ideally substitutional random-alloy system Cu-Ni are calculated using the coherent-potential approximation for a range of concentrations of the constituents across the complete alloy diagram. It is shown that previous model calculations for Ni-rich paramagnetic Cu-Ni alloys using the coherent-potential approximation can be extended to alloys of arbitrary concentration if appropriate Cu and Ni potential functions are used. The results obtained are consistent with experimental photoemission and soft-x-ray emission profiles in so far as comparisons can be effected. The results indicate the limits of this simple nonmagnetic random-alloy theory for discussing the conventional low-temperature specific-heat data of these alloys. For Cu-rich alloys the results correspond to a split-band regime while for Ni-rich alloys the d bands associated with Cu and with Ni sites in the alloy overlap to a considerable extent. For all Cu-Ni alloys the rigid-band model and the virtual-crystal approximation are quite inappropriate.