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- W2003184320 abstract "The optical absorption of substitutional ${mathrm{Fe}}^{2+}$ ions in ${mathrm{Cd}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Fe}}_{mathit{x}}$Te compounds has been measured in the far infrared (10--80 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$) at temperatures from 5 to 300 K. Electronic transitions inside the $^{5}$E multiplet of ${mathrm{Fe}}^{2+}$ are observed at low temperature, but the crystal-field model is not sufficient to explain the experimental features. Calculations of the $^{5}$E electron states are performed, taking into account the Jahn-Teller interaction with the vibrations of the host lattice. The electron-phonon coupling is approximated by a single pair of E modes corresponding to TA(L) phonons. Energies and oscillator strengths for electric- and magnetic-dipole transitions from the ground state to excited levels are calculated within the Jahn-Teller model. An excellent quantitative agreement is obtained with the low-temperature absorption lines for a Jahn-Teller energy of 2.5 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, an effective spin-orbit splitting ensuremath{lambda}=-101.9 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, a spin-spin interaction coefficient ensuremath{rho}=0.18 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, and a phonon energy of the TA(L) mode (28ifmmodepmelsetextpmfi{}0.5 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$) quite consistent with the neutron-scattering results. The high-temperature far-infrared absorption spectra give also evidence for a local mode of Fe in CdTe and for a two-phonon process involving the TA(X) mode of CdTe (35ifmmodepmelsetextpmfi{}0.5 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$)." @default.
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- W2003184320 date "1992-07-15" @default.
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- W2003184320 title "Dynamic Jahn-Teller effect on the far-infrared spectrum ofFe2+inCd1−xFexTe compounds" @default.
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- W2003184320 doi "https://doi.org/10.1103/physrevb.46.2183" @default.
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