SYNCHROTRON RADIATION STUDY OF CD1-XMNXTE (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.65)
SYNCHROTRON RADIATION STUDY OF CD1-XMNXTE (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.65)
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DOI：
10.1103/physrevb.33.1206
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发表时间：
1986-01-15
影响因子：
3.7
通讯作者：
CARDONA, M
中科院分区：
文献类型：
--
作者：
TANIGUCHI, M;LEY, L;CARDONA, M
在光子能量20 ~ 140 eV范围内，用光电子发射研究了Cd 1−x Mn x Te（0≤x≤0.65）的电子结构。在价带最大值（VBM）以下3.4 eV处有一个明显的峰（半最大值处的全宽为1 eV），这是由具有e对称性的Mn 3d ^态发射的。t2组分与Te 5p态杂化显著，因此几乎均匀地贡献于价带的前6 eV。由于p-d杂化，混合Mn - 3d-Te - 5p的弱结构也出现在6 eV以下。当相对于VBM测量时，Cd和Te的4d核能级结合能在整个Mn浓度范围内保持恒定。这意味着存在可忽略不计的化学位移，并且VBM不受Mn取代Cd的影响。因此，随着x的增加，光学间隙的增加是由于导带能量的增加，与部分产率光谱测量的Te 4d吸收阈值的移动一致。在空导态密度中，Te 5p分量的最大值大于阈值（≥2 eV）。Mn 3p→3d↓激发是原子状的。这些结果可以用cd1−x Mn x Te的能带结构的原子轨道线性组合水平图式来解释。
The electronic structure of Cd 1− x Mn x Te (0≤ x≤ 0.65) has been investigated by photoemission in the photon energy range from 20 to 140 eV. A sharp (≊ 1 eV full width at half maximum) peak located 3.4 eV below the valence-band maximum (VBM) is assigned to emission from Mn 3 d↑ states with e symmetry. The t 2 components hybridize significantly with the Te 5p states and contribute therefore nearly uniformly to the top 6 eV of the valence bands. Weak structures below 6 eV of mixed Mn 3d–Te 5p character occur also due to the p-d hybridization. Cd and Te 4d core-level binding energies remain constant over the whole range of Mn concentrations when measured relative to the VBM. This implies that there are negligible chemical shifts and that the VBM is not affected by the replacement of Cd by Mn. The increase in the optical gap with x is thus due to an increase of the conduction-band energy, in agreement with a shift in the Te 4d absorption threshold as measured by partial-yield spectroscopy. A maximum of the Te 5p component in the density of empty conduction states is identified≊ 2 eV above threshold. The Mn 3p→ 3 d↓ excitations are atomiclike. The results are interpreted in terms of a schematic linear-combination-of-atomic-orbitals level scheme for the band structure of Cd 1− x Mn x Te.