Nuclear magnetic resonance studies of II–VI semiconductor alloys

Zamir, D.; Beshah, Kebede; Becla, P.; Wolff, Peter; Griffin, R. G.; Zax, David B.; Vega, S.; Yellin, N.

doi:10.1116/1.575516

Cited by 37 publications

(20 citation statements)

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“…Using this approach, Wei and Zunger 12 have calculated from first principles the electronic structure of Cd 1Ϫx Hg x Te, and the authors of Refs. 13-15 have interpreted fine NMR structure from 125 Te nuclei in the cation alloys Hg 1Ϫx Cd x Te, [13][14][15] Cd 1Ϫx Zn x Te, 14 and Cd 1Ϫx Mn x Te. 14 Figure 7 shows the Cd(4Ϫn)Hg(n)Te tetrahedral basis cells with nϭ0, 1, 2, 3, and 4.…”

Section: A Lattice Modes Of Cd-te and Hg-te Vibrationsmentioning

confidence: 99%

“…When it is applied to the cation substitution alloys Cd 1Ϫx Hg x Te, 13,14 Cd 1Ϫx Zn x Te, 14 and Cd 1Ϫx Mn x Te, 14 the chemical shift of the resonance frequency of the Te nuclei is characterized by a set of discrete lines whose number depends on the local composition. The lines are attributed to five possible cation configurations of the form A(4Ϫn)B(n) (nϭ0,1,2,3,4) around each Te anion.…”

Section: Introductionmentioning

confidence: 99%

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Structural analysis of the semiconductor-semimetal alloyCd1−xHgxTeby infrare

1998

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Far-infrared reflectivity measurements have been made on traveling-heater-method-grown Cd 1Ϫx Hg x Te bulk single crystals. The spectra at 300, 77, and 25 K display two bands with fine structure, which cannot be explained by the usual two-oscillator model. These lattice spectra are shown to originate from four Cd-Te and Hg-Te vibrational modes in five basic Cd(4Ϫn)Hg(n)Te (nϭ0,1,2,3,4) cells consisting of cations tetrahedrally distributed around a shared Te anion. The mode frequencies are determined by the cation configuration in each cell. They are assumed to be independent of alloy composition, which determines only the mode strengths. The temperature dependence of the Cd-Te and Hg-Te vibrations revealed differences. The Cd-Te frequencies decrease with temperature, as is typical for semiconductor compounds. For the Hg-Te vibrations the temperature dependence is more complicated. Such temperature behavior was explained by influence of the anharmonicity corrections, which change sign with variation of frequency. Dispersion analysis of the dielectric function Љ(w) restored from the reflection spectra of the alloys at 25 K by Kramers-Kronig analysis revealed a peculiarity at 137 cm Ϫ1 , which appears with nearly constant strength over the wide compositional range x ϭ0.1-0.8. This mode has the same temperature dependence as the Cd-Te vibrational modes. The most probable explanation of this mode is associated with the alloy disorder or with multiphonon processes.

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Section: A Lattice Modes Of Cd-te and Hg-te Vibrationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural analysis of the semiconductor-semimetal alloyCd1−xHgxTeby infrare

1998

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“…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 …”

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confidence: 96%

Manganese Distribution in CdMnTeSe Crystals. EXAFS Data Analysis

et al. 1996

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The extended X-ray absorption fine structure (EXAFS) technique has been used to investigate the first shell coordination in zinc-blende quaternary In tetrahedrally coordinated III-V and II-VI semiconducting compounds there exist two sublattices occupied respectively by anions and cations. In Α1-x B x C and ΑC1-yDy ternary or A1-xBxC1-yDy quaternary compounds a basic question concerns a random or non-random substitution of the Α by B and C by D ions in respective sublattices. The first answer to this question has been obtained from infrared phonon mode analysis for GaΡl-and CdTe1-y Sey [4] ternary alloys. 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

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“…(Similar features were observed in a separate mechanical grade sample Hgo. 8 Cdo. 2 Te, also purchased from Cominco Electronics, using a solid state detector and monochromatic radiation.…”

Section: X-ray Methods and Data Analysismentioning

confidence: 98%

“…Compaan et al 1 attribute this behavior to a breaking up of the Hg: Cd 3 :1 cluster followed by a freezing in of a more random distribution. Based on the 125 Te NMR chemical shifts, Zax et al 9 and Zamir et al 8 also conclude that the Hg: Cd 3:1 cluster is favored in this system. Even though quantitative distributions are difficult to obtain with these methods, both studies suggest that, rather than local clustering, local ordering is occurring with a preference for 3 :1 Hg-Cd near-neighbor quadruplets.…”

Section: Introductionmentioning

confidence: 93%

A study of the local atomic structure in Hg_0.80Cd_0.20Te using x-ray diffuse scattering

Quintana

Cohen

1993

J. Mater. Res.

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The local atomic arrangements in a commercial n-type wafer of Hg0.gCd0.2Te were investigated by measuring the diffuse x-ray scattering in two volumes in reciprocal space. A change in contrast between the two measurements was achieved by making one volume measurement at 12037 eV and a second volume measurement at 12270 eV, i.e., near the Hg Lm edge. The difference between these two measurements yielded intensity only due to Hg-Hg, Hg-Te, and Hg-Cd pair interactions. In all three patterns, peak-like features were apparent at the forbidden Bragg peak positions on thermal diffuse scattering ridges that joined major Bragg reflections; these are primarily attributed to second order displacement effects on the mixed cation sublattice. The first two Warren-Cowley short-range order parameters were determined to be an 0 = -0.050(26) and ffu 0 = 0.118(35). Simulations of the structure revealed small ordered regions with a preference for 3 :1 Hg-Cd near-neighbor configurations. The near-neighbor Hg-Te bonds contract from that calculated from the average crystal's lattice parameter, and this Hg-Te distance is less than the distance in HgTe.

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Nuclear magnetic resonance studies of II–VI semiconductor alloys

Cited by 37 publications

References 0 publications

Structural analysis of the semiconductor-semimetal alloyCd1−xHgxTeby infrare

Structural analysis of the semiconductor-semimetal alloyCd1−xHgxTeby infrare

Manganese Distribution in CdMnTeSe Crystals. EXAFS Data Analysis

A study of the local atomic structure in Hg_0.80Cd_0.20Te using x-ray diffuse scattering

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Nuclear magnetic resonance studies of II–VI semiconductor alloys

Cited by 37 publications

References 0 publications

Structural analysis of the semiconductor-semimetal alloyCd1−xHgxTeby infrare

Structural analysis of the semiconductor-semimetal alloyCd1−xHgxTeby infrare

Manganese Distribution in CdMnTeSe Crystals. EXAFS Data Analysis

A study of the local atomic structure in Hg0.80Cd0.20Te using x-ray diffuse scattering

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A study of the local atomic structure in Hg_0.80Cd_0.20Te using x-ray diffuse scattering