Indirect measurements of the Jahn-Teller quenched spin-orbit splitting in the 5T2g-state of KMgF3:Fe2+ |
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Authors: | A Hjortsberg B Nygren JT Vallin |
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Institution: | Department of Physics, Chalmers University of Technology, S-402 20 Gothenburg, Sweden |
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Abstract: | The energy separation of the first excited spin-orbit States Γ3g, Γ4g from the Γ5g ground state, in the orbital 5T2g triplet state of Fe2+ in KMgF3, has been estimated from temperature dependence measurements on the 7860 cm-1 zero-phonon-line (ZPL) transition from Γ5g to the orbital 5Eg doublet state. Using a simplified crystal field energy level model, we find the Γ5g Γ3g, Γ4g separation to be ~30 cm-1, indicating that the vibronic Jahn-Teller coupling is considerably stronger in KMgF3:Fe2+ than in MgO:Fe2+. Far infrared absorption data on KMgF3:Fe2+ in magnetic fields up to 6T, are found to be consistent with this interpretation. |
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