Nature of magnetic circular dichroism and absorption spectra of f-f transitions in Na0.4Ho0.6F2.2 single crystal

A. V. Malakhovskii, V. V. Sokolov, D. N. Karimov

Research output: Contribution to journalArticlepeer-review

Abstract

We present first study of magnetic circular dichroism (MCD) spectra of Ho3+ ion in C4v local symmetry, which it has in fluorite Na0.4Ho0.6F2.2. Optical absorption and MCD spectra were studied in this single crystal in the region of 5I85F3, 5F2, 3K8 and 5G5 transitions in the temperature range 3.6–––90 K. It was revealed, that number of transitions observed in the MCD and absorption spectra coincides with the number of transitions only from the doublet E state to singlet excited states. The E-E type transitions are not active in MCD, but they are not observed in the absorption spectra either. Paramagnetic magneto-optical activities (MOA) of the absorption bands and their temperature dependences were measured and interpreted with the help of the theory based on the nature of f-f transitions allowance. The MCD spectra were also analyzed in approximation of the J,±MJ wave functions of the free atom. It was shown in particular, that the lowest initial state of the transitions observed at T > 10 K had MJ = 7, but this is not the lowest state of the holmium ion in the crystal. A little lower there is a quasi-doublet with MJ = 8 and, accordingly, with a higher magneto-optical activity of transitions from it. However, the intensity of transitions from this state is low.

Original languageEnglish
Article number112257
JournalChemical Physics
Volume581
DOIs
StatePublished - 1 May 2024
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2024 Elsevier B.V.

Funding

Investigation of absorption and magnetic circular dichroism spectra were fulfilled within the State assignments of Kirensky Institute of Physics, Federal Research Center KSC SB of the Russian Academy of Sciences. The crystal growth and samples characterization were performed within the State assignments of the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences.

FundersFunder number
Russian Academy of Sciences

    Keywords

    • Fluoride crystals
    • Ho ions
    • Magnetic circular dichroism
    • f-f transitions

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