Bulk spin polarization of Co(1-x)Fe(x)S2.
Bulk spin polarization of Co(1-x)Fe(x)S2.
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DOI：
10.1103/physrevlett.103.226403
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发表时间：
2009-11
影响因子：
8.6
通讯作者：
C. Utfeld;S. Giblin;Jonathan Taylor;J. Duffy;C. Shenton-Taylor;J. Laverock;S. Dugdale;M. Manno;C. Leighton;M. Itou;Yoshiharu Sakurai
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文献类型：
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作者：
C. Utfeld;S. Giblin;Jonathan Taylor;J. Duffy;C. Shenton-Taylor;J. Laverock;S. Dugdale;M. Manno;C. Leighton;M. Itou;Yoshiharu Sakurai
本文报道了一种用从头计算模拟磁康普顿散射来确定Co(1-x)Fe(x)S2单晶体自旋极化程度的新方法。测量了co2和Co0.9Fe0.1S2的自旋相关康普顿谱。然后通过严格移动波段来改进从头计算，以提供每个样品的计算和实验方向剖面之间的最佳拟合。体自旋极化，P，对应于自旋极化密度的状态在费米水平，然后从改进的计算中提取。co_2和Co0.9Fe0.1S2的P值分别为P=-72+/-6%和P=18+/-7%。此外，还得到了费米速度(v（F)或v(F)2）加权的P值，从而可以与其他实验数据进行严格的比较，并突出了P对v(F)的实验依赖性。
We report on a new method to determine the degree of bulk spin polarization in single crystal Co(1-x)Fe(x)S2 by modeling magnetic Compton scattering with ab initio calculations. Spin-dependent Compton profiles were measured for CoS2 and Co0.9Fe0.1S2. The ab initio calculations were then refined by rigidly shifting the bands to provide the best fit between the calculated and experimental directional profiles for each sample. The bulk spin polarizations, P, corresponding to the spin-polarized density of states at the Fermi level, were then extracted from the refined calculations. The values were found to be P=-72+/-6% and P=18+/-7% for CoS2 and Co0.9Fe0.1S2, respectively. Furthermore, determinations of P weighted by the Fermi velocity (v(F) or v(F)2) were obtained, permitting a rigorous comparison with other experimental data and highlighting the experimental dependence of P on v(F).