Extended x-ray-absorption fine-structure studies ofZn1−xMn

Abstract

Bond lengths, Debye-Wailer factors, and site occupancy in the diluted magnetic semiconductor Zn, "Mn"Sehave been measured using extended x-ray-absorption fine structure. The nearestneighbor bond lengths at both room temperature and low temperature {77 K) are found to be con-0 stant as a function of alloy composition within the experimental uncertainty of 0.01 A. Because the average cation-cation distance changes with Mn content, these results necessarily imply distortion of the tetrahedral bond angles. The anion sublattice is shown to suffer the largest distortion, but the cation sublattice also exhibits some relaxation. The repercussions of these results are discussed, in terms of the amount of cation and anion sublattice distortion at low temperature and its connection to the superexchange mechanism occurring between the Mn'+ ions and mediated by the intervening anion in Zn&, Mn"Se.

Manganese Distribution in CdMnTeSe Crystals. EXAFS Data Analysis

“…In all these experiments an additional feature in the infrared reflectivity spectrum has been observed and interpreted as a result of next nearest neighbours clustering [1][2][3][4]. The information concerning the partial clustering of ternary compounds have been also obtained from nuclear magnetic resonance in CdHgTe [5] and recently, in extended X-ray absorption fine stucture (EXAFS) analysis for diluted magnetic semiconduction ZnMnSe [6], as well as for non-magnetic quaternary In1-x Gax Sb1-y Asy alloys [7]. EXAFS analysis for ZnMnSe [6] shows that Zn-Mn coordination number is slightly larger, and Zn-Zn …”

“…The information concerning the partial clustering of ternary compounds have been also obtained from nuclear magnetic resonance in CdHgTe [5] and recently, in extended X-ray absorption fine stucture (EXAFS) analysis for diluted magnetic semiconduction ZnMnSe [6], as well as for non-magnetic quaternary In1-x Gax Sb1-y Asy alloys [7]. EXAFS analysis for ZnMnSe [6] shows that Zn-Mn coordination number is …”

“…Pong et al [6] explained this deviation from randomness, mainly as an influence of Mn-Mn superexchange interaction in ZnMnSe. In quaternary alloys, atomic correlations are expected to be larger than for ternaries because nearest-neighbours preferences are possible.…”

Statistical model analysis of local structure of quaternary sphalerite crystals

“…As generally reported, ternary tetrahedron coordinated A 1-x B x Z and AY y Z 1-y systems ( [12][13][14][15] for FIR and [16][17][18][19][20][21][22][23][24][25][26][27][28] for EXAFS), as well as balanced quaternaries of type A 1-x B x Y y Z 1-y (such as GaInAsSb [29] for EXAFS, CdMnSeTe [30] for EXAFS and [6,31] for FIR, analyzed in [32], ZnCdSeTe [33] for FIR), and unbalanced quaternary A 1-x-x′ B x′ C x Z (such as MnCdHgTe [34], ZnCdHgTe [35,36]), or AX y Y y′ Z 1-y-y′ system FIR spectra all exhibit SOPs; such preferences are linked to the thermodynamic properties of each system.…”

EXAFS Determination of Bond Lengths in Zn1-xFexS Ternary Alloys

“…Therefore, the EXAFS method has been successfully applied for investigating the local structure of the wide-gap II-VI cornpounds with Mn content (e.g. [4][5][6][7]) as well as with the other transition metals [8].…”