教師資料查詢 | 類別: 期刊論文 | 教師: 鄭伯昆 TSENG POH-KUN (瀏覽個人網頁)

標題:Degree of p-d hybridization in Zn1-xMnxY(Y=S, Se)and Zn1-xCoxS alloys as studies by x-ray absorption spectroscopy
學年85
學期2
出版(發表)日期1997/03/01
作品名稱Degree of p-d hybridization in Zn1-xMnxY(Y=S, Se)and Zn1-xCoxS alloys as studies by x-ray absorption spectroscopy
作品名稱(其他語言)
著者Pong, W.F.; Mayanovic, R.A.; Kao, J.K.; Hsieh, H.H.; Pieh, J.Y.; Chang, Y.K.; Kuo, K.C.; Tseng, P.K.
單位淡江大學物理學系
出版者College Park: American Physical Society
著錄名稱、卷期、頁數Physical review. B (Condensed Matter) 55(12), pp.7633-7640
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 L3,2 edge. Analysis of the Mn L3,2-edge XANES spectra for Zn1-xMnxY and Co L3,2-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) 2p3/2 and 2p1/2photoelectron excitations to nonbonding 3d(e) states and to the relatively broadened band of Mn (Co) 3d(t2)–S 3p hybridized antibonding states for the sulfides, and to Mn 3d(t2)–Se 4p hybridized states for the selenides. The rate of increase of L3,2 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(t2)–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 Å) and Co-S (2.30 Å) 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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語言英文
ISSN0163-1829;1095-3795
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