Spin Hamiltonian Parameters for Co2+ Ions in PbMoO4 Crystal - Interplay between the Fictitious Spin S'=1/2 and the Effective Spin S̃ =3/2

D. Piwowarskaa, S.M. Kaczmarek a, P. Gnutek a and C. Rudowicza,b aInstitute of Physics, West Pomeranian University of Technology, al. Piastów 17, 70-310 Szczecin, Poland bvisiting professor: Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89B, 61-614 Poznań, Poland

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The interplay between the fictitious spin S' = 1/2 and the effective spin S̃=3/2 for Co2+(3d7) ions is considered. The available experimental data on the Ze gi' factors for the two Co2+ complexes in PbMoO4 obtained using the fictitious "spin" S'=1/2 description serve for determination of the Zeeman gi factors corresponding to the effective spin S̃ =3/2. The second-rank zero-field splitting parameters D and E (S̃ = 3/2) are also indirectly determined from the experimental EMR data by employing the formulas arising from projection of the gi(S̃=3/2) factors onto the gi'(S' = 1/2) factors. The so-determined second-rank zero-field splitting parameters and gi(S̃ = 3/2) factors will enable comparison with the respective quantities obtained in a subsequent paper using a combined modeling approach.

DOI: 10.12693/APhysPolA.132.73 PACS numbers: 75.10.Dg, 71.70.Ch, 61.50.Ah, 61.72.Hh, 76.30.-v, 76.30.Fc