Crystal-field model of vanadium in 6H silicon carbide

Kaufmann, B.; Dörnen, A.; Ham, Frank S.

doi:10.1103/physrevb.55.13009

Cited by 38 publications

(60 citation statements)

References 11 publications

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“…The level ordering for Ni i ϩ is closely related to that found for neutral substitutional vanadium in SiC, a system which has recently been explored by Kaufmann et al 12 V s 0 , when occupying the hexagonal substitutional site ͑the ␣ site͒ in 6H SiC, differs from the Ni i ϩ system in diamond in two respects: ͑i͒ V s 0 has an electronic configuration 3d 1 ( 2 D), ͑and, for that reason, is referred to as V 4ϩ by Kaufmann et al͒, ͑ii͒ it experiences a cubic crystal field of opposite sign ͑as also observed for substitutional impurities in Si͒. These two differences each cause an inversion of the E and T 2 levels, and thus the ordering of these two levels ends up to be the same for the two systems.…”

Section: A Level Schemementioning

confidence: 54%

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Magnetic circular dichroism of the 1.404-eV interstitial nickel absorption transition in high-pressure synthetic diamond

1999

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A high-resolution magnetic circular dichroism ͑MCDA͒ study of the sharp 1.404-eV zero-phonon absorption line associated with interstitial nickel in high-pressure synthetic diamond is reported. A model is presented attributing the absorption to internal transitions within the 3d 9 configuration of Ni i ϩ , as perturbed by the cubic field at the diamond interstitial site, plus a smaller trigonal crystal field. The model provides a consistent explanation of the signs of the circular absorption coefficients of all the observed transitions plus the unusual features of the g values observed for the ground (g Ќ ϳ0) and excited (g ʈ ϳ0) states. A search for an optically detected magnetic resonance in the MCDA was unsuccessful, consistent with the forbidden magnetic resonance transition for an Sϭ1/2, g Ќ ϭ0 ground state. ͓S0163-1829͑99͒13231-4͔PRB 60 5423 MAGNETIC CIRCULAR DICHROISM OF THE 1.404-eV . . .

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Section: A Level Schemementioning

confidence: 54%

“…Kaufmann et al 12 expressed the Hamiltonian of Eq. ͑7͒ in a basis set whose wave functions are direct products of orbital angular-momentum eigenstates appropriate to Lϭ2 and spin states of Sϭ1/2.…”

Section: A Level Schemementioning

confidence: 99%

Magnetic circular dichroism of the 1.404-eV interstitial nickel absorption transition in high-pressure synthetic diamond

1999

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“…This is clearly demonstrated in the case of incorporation of transition metals from the first row of the periodic table in SiC, which can be seen from optical studies on, for instance, vanadium [1][2][3][4][5], chromium [5,6], and titanium [5,[7][8][9]. All these elements replace Si atoms due to their rather large atomic radii.…”

Section: Introductionmentioning

confidence: 86%

Optical properties and Zeeman spectroscopy of niobium in silicon carbide

et al. 2015

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The optical signature of niobium in the low-temperature photoluminescence spectra of three common polytypes of SiC (4H, 6H, and 15R) is observed and confirms the previously suggested concept that Nb occupies preferably the Si-C divacancy with both Si and C at hexagonal sites. Using this concept we propose a model considering a Nb-bound exciton, the recombination of which is responsible for the observed luminescence. The exciton energy is estimated using first-principles calculation and the result is in very good agreement with the experimentally observed photon energy in 4H SiC at low temperature. The appearance of six Nb-related lines in the spectra of the hexagonal 4H and 6H polytypes at higher temperatures is tentatively explained on the grounds of the proposed model and the concept that the Nb center can exist in both C 1h and C 3v symmetries. The Zeeman splitting of the photoluminescence lines is also recorded in two different experimental geometries and the results are compared with theory based on phenomenological Hamiltonians. Our results show that Nb occupying the divacancy at the hexagonal site in the studied SiC polytypes behaves like a deep acceptor.

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“…A large number of theoretical [10][11][12] and experimental [6][7][8][9] investigations have been devoted to the study of the 2+ charge state of iron in III-V semiconductors such as InP, GaP and GaAs.…”

Section: Discussion and Comparison Between Theory And Experimentsmentioning

confidence: 99%

“…The existence of a Jahn-Teller coupling between the electronic states of the Fe 2+ substitutional impurities and phonons or local vibrational modes of the host III-V semiconductor was investigated by a number of people [10][11][12][13]. All these papers focused on only some of the experimental data but did not attempt to explain with a single model the optical absorption, photoluminescence and isotopic measurements.…”

Section: Introductionmentioning

confidence: 99%

The effect of electron-phonon interaction in iron-doped III-V cubic semiconductors

Colignon

Kartheuser

Villeret

2000

J. Phys.: Condens. Matter

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Abstract.A theoretical study of optical absorption and emission measurements of Fe 2+ as a substitutional impurity in InP and GaP is presented. A new interpretation of the low-temperature absorption spectrum is proposed based on a weak Jahn-Teller interaction between the electronic excited states and a local gap mode of 5 symmetry. The model also includes the crystal potential, hybridization with the orbitals of the ligands of the host crystal, spin-orbit interaction and a weak dynamic Jahn-Teller coupling of the orbital ground state of Fe 2+ with transverse acoustic phonons of 3 symmetry. The theoretical model describes with good accuracy the measured positions and relative intensities of the spectral lines. In addition, the mass dependence of the local gap mode of 5 symmetry reproduces the general features of the fine structures associated with the isotopic shifts of the zero-phonon line and the contribution to the isotopic shifts arising from the difference in zero-point energy between the initial and final states of the transition is evaluated.

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Crystal-field model of vanadium in 6H silicon carbide

Cited by 38 publications

References 11 publications

Magnetic circular dichroism of the 1.404-eV interstitial nickel absorption transition in high-pressure synthetic diamond

Magnetic circular dichroism of the 1.404-eV interstitial nickel absorption transition in high-pressure synthetic diamond

Optical properties and Zeeman spectroscopy of niobium in silicon carbide

The effect of electron-phonon interaction in iron-doped III-V cubic semiconductors

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