Optical investigation of Ni impurity in ZnSe under hydrostatic pressure

Wasik, D.; Liro, Z.; Baj, M.

doi:10.1016/0022-0248(90)91016-j

Cited by 15 publications

(12 citation statements)

References 13 publications

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“…These levels may serve as a probe in the determination of absolute pressure coefficients of the conduction and valence band edges. [1] Therefore, in Refs [1] and [2], PS of the optical spectra for the d-d transition and charge transfer process of ZnSe:Ni 2+ were measured at low temperature and hydrostatic pressure.…”

Section: Introductionmentioning

confidence: 99%

The Pressure-Induced Shifts of Energy Spectra of ZnSe:Ni ²⁺

Ma¹,

Chen²,

Ning³

2001

Commun. Theor. Phys.

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The calculations of the whole energy spectrum of ZnSe:Ni2+ at normal pressure and pressure-induced shifts of its levels have been carried out on the basis of the theory of pressure-induced shifts and the diagonalization of the complete d8 energy matrix in a regular tetrahedral field. The calculated results are in very good agreement with experimental data at normal and various pressures. By taking into account the pressure-induced shifts of spectral bands, the new assignments of bands are given. The comparison between the results of ZnSe:Ni2+ and MgO:Ni2+ shows that the covalency of the bonding between Ni2+ and ligands (Se2-) in ZnSe:Ni2+ is obviously stronger than the one of the bonding between Ni2+ and ligands (O2-) in MgO:Ni2+; the expansion of electron wavefunctions of Ni2+ in ZnSe:Ni2+ under pressure is obviously larger than that of Ni2+ in MgO:Ni2+ under pressure. On the basis of these results, the physical origins of the remarkable difference between the pressure-induced shifts of levels of ZnSe:Ni2+ and those of MgO:Ni2+ are explained. It is found that the large expansion of electron wavefunctions and a phase transition of ZnSe:Ni2+ make the pressure-induced shifts of levels of ZnSe:Ni2+ strongly nonlinear.

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Section: Introductionmentioning

confidence: 99%

The Pressure-Induced Shifts of Energy Spectra of ZnSe:Ni ²⁺

Ma¹,

Chen²,

Ning³

2001

Commun. Theor. Phys.

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“…1], b Ref [5],. T is the irreducible representation of O group; TT is the one taking into account spin-orbit coupling.…”

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The Pressure-Induced Shifts of Energy Spectra of ZnS:Ni ²⁺

Chen

2000

Commun. Theor. Phys.

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The calculations of the whole energy spectrum of ZnS:Ni 2+ at normal pressure and pressure-induced shifts of its levels have been carried out on the basis of the theory of pressure-induced shifts and the diagonalization of the complete d 8 energy matrix in a regular tetrahedral Geld. The calculated results are in very good agreement with experimental data at normal and high pressures. The comparison between the results of ZnS:Ni 2+ and MgO:Ni 2+ indicates that the covalency of ZnS:Ni 2+ is obviously stronger than the one of MgO:Ni 2+ ; the expansion of electron wavefunctions of ZnS:Ni 2+ under pressure is obviously larger than that of MgO:Ni 2+ ; and the pressure-induced shifts of levels of ZnS:Ni 2+ show strong nonlinearity.

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“…Recently it has been shown that under hydrostatic pressure most of the absorption bands due to intracenter excitations of Νi2+ impurity in ZnS and ZnSe shift rigidly with the pressure coefficients which have been described in the frame of the Static Crystal Field Theory (SCFT) [1,2]. In this model it was sufficient to introduce the pressure-dependent crystal field parameter Δ and the Racah parameter B (C/B was taken as pressure-independent and the spin-orbit interaction was neglected).…”

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confidence: 99%

“…without spin-orbit and electron-lattice interactions) pressure coefficients, ∂Ε1 /∂Ρ, of both states in respect to the ground state where α = κ -the bulk compressibility and R -the distance between an impurity ion and ligands and μ -the reduced mass. The zero-pressure value of the energetic separation between both interacting levels, Ε0, was the fitting parameter, while its pressure variation was determined from ∂Εi/∂Ρ of the levels [1,2].…”

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confidence: 99%

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Pressure-Dependent Coupling of the³A₂(F) and¹T₂(D) States of Ni²⁺in ZnS and ZnSe

1991

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We have investigated two close-lying 3 A2(F) and 1 T2(D) states of Nit+ impurity in ZnS and ZnSe. These states are strongly coupled to each other via the spin-orbit interaction and therefore, small variations of their energies induced by pressure have significantly changed absorption spectra related to them. In order to give a good interpretation to the experimental results we took into account the interaction between both states, their coupling to the lattice vibrations and the pressure-dependent separation between them.

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Optical investigation of Ni impurity in ZnSe under hydrostatic pressure

Cited by 15 publications

References 13 publications

The Pressure-Induced Shifts of Energy Spectra of ZnSe:Ni ²⁺

The Pressure-Induced Shifts of Energy Spectra of ZnSe:Ni ²⁺

The Pressure-Induced Shifts of Energy Spectra of ZnS:Ni ²⁺

Pressure-Dependent Coupling of the³A₂(F) and¹T₂(D) States of Ni²⁺in ZnS and ZnSe

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Optical investigation of Ni impurity in ZnSe under hydrostatic pressure

Cited by 15 publications

References 13 publications

The Pressure-Induced Shifts of Energy Spectra of ZnSe:Ni 2+

The Pressure-Induced Shifts of Energy Spectra of ZnSe:Ni 2+

The Pressure-Induced Shifts of Energy Spectra of ZnS:Ni 2+

Pressure-Dependent Coupling of the3A2(F) and1T2(D) States of Ni2+in ZnS and ZnSe

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The Pressure-Induced Shifts of Energy Spectra of ZnSe:Ni ²⁺

The Pressure-Induced Shifts of Energy Spectra of ZnSe:Ni ²⁺

The Pressure-Induced Shifts of Energy Spectra of ZnS:Ni ²⁺

Pressure-Dependent Coupling of the³A₂(F) and¹T₂(D) States of Ni²⁺in ZnS and ZnSe