INFLUENCE OF TRANSITION-METAL TYPE AND CONTENT ON LOCAL-ORDER PROPERTIES OF ZN(1-X)M(X)S (M=MN,FE,CO) ALLOYS STUDIED USING XANES SPECTROSCOPY

X-ray-absorption near-edge-structure (XANES) spectra of the diluted-ma gnetic-semiconductor system Zn1-xMnxS have been measured at the Zn L(I II,II) edge and of Zn(1-x)M(x)S (M=Mn,Fe,Co) at the S K edge using the total-electron-yield mode. The Zn LIII edge results for Zn1-xMnxS sho w a dramatic reduction in intensity of the first prominent feature, ju st above the edge, in the XANES spectra. Analysis of the S K-edge XANE S spectra for Zn(1-x)M(x)S revealed the appearance of a pre-edge peak, having linear x dependence in intensity and assigned to S Is photoele ctron excitations to an empty narrow band of S 3p-M 3d(t(2)) hybridize d antibonding states. The rate of peak intensity with M concentration is associated with differences in the degree of p-d hybridization of s tates between the transition metal and sulfur. Features above the edge are generally found to decrease in intensity with an increase in tran sition-metal content in the alloys. The results are consistent with mo re S 3p-transition metal (M) 3d(t(2)) hybridized states and less S 3p- Zn 4(s,p) and S 3p-Zn 3d hybridized states becoming available as the t ransition-metal content increases in the alloys.