Degree of p-d hybridization in Zn1-xMnxY (Y=S,Se) and Zn1-xCoxS alloys as studied by x-ray-absorption spectroscopy

被引:14
作者
Pong, WF
Mayanovic, RA
Kao, JK
Hsieh, HH
Pieh, JY
Chang, YK
Kuo, KC
Tseng, PK
Lee, JF
机构
[1] SW MISSOURI STATE UNIV,DEPT PHYS & ASTRON,SPRINGFIELD,MO 65804
[2] SYNCHROTRON RADIAT RES CTR,HSINCHU 300,TAIWAN
来源
PHYSICAL REVIEW B | 1997年 / 55卷 / 12期
关键词
D O I
10.1103/PhysRevB.55.7633
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have measured x-ray-absorption near-edge-structure (XANES) spectra of the diluted magnetic semiconductors Zn1-xMnxY (Y = S,Se) and Zn1-xCoxS alloys at the Mn and Co L(3,2) edge. Analysis of the Mn L(3,2)-edge XANES spectra for Zn1-xMnxY and Co L(3,2)-edge spectra for Zn1-xCoxS revealed the presence of a white-line feature in each series, whose intensity increased linearly with concentration x. The white-line feature is assigned to Mn(Co) 2p(3/2) and 2p(1/2) photoelectron excitations to nonbonding 3d(e) states and to the relatively broadened band of Mn (Co) 3d(t(2))-S 3p hybridized antibonding states for the sulfides, and to Mn 3d(t(2))-Se 4p hybridized states for the selenides. The rate of increase of L(3,2) white-line intensity with x is associated with the difference in the degree of p-d hybridization of states between Mn (Co) 3d and S 3p for the sulfides, and between Mn 3d and Se 4p for the selenides. Our results indicate that the magnetic-transition-metal 3d(t(2))-anion p hybridization is strongest for Zn1-xCoxS, intermediate for Zn1-xMnxS and least for Zn1-xMnxSe. From separate and Co K-edge extended x-ray-absorption fine-structure measurements on Zn1-xMnxS and Zn1-xCoxS at 77 K, we found that the nearest-neighbor (NN) Mn-S (2.42 Angstrom) and Co-S (2.30 Angstrom) bond lengths remained essentially constant with x in these alloys, respectively. The degree of relaxation of the NN Mn (Co)-anion bond lengths is found to be directly related to the strength of p-d hybridization coupling in these alloys.
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收藏
页码:7633 / 7640
页数:8
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