Abstract
The important mechanisms of supertransferred hyperfine (STHF) interactions in N−O−M chains are briefly discussed: (i) spin polarization ofns states in the N-ion due to the s-d exchange interaction,H sdSTHF ; (ii) contributions of spin-polarized states of the intervening O-ion,H IISTHF ; (iii) transfer of d-electrons of the M-ion to emptyns states in the N-ion,H IIISTHF . The dependence ofH STHF upon the N−O−M bond configuration, electronic structure, and orbital state of the M-ion is presented in a convenient form. The STHF interactions in the chains Sn4+−O2−−Fe3+, Cr3+ in compounds with slightly distorted Perovskite structure are considered. The STHF field in the chain Sn4+−O2−−Cr3+ is shown to change the sign within the range of angles near 170°. This conclusion is in line with published data on the isoelectronic chain Sn4+−O2−Mn4+ in the compounds Ca1−x Sr x MnO3. The results obtained for the N−O−Fe3+ chain are rationalized by the predicted angular dependence ofH STHF=α+β cos θ+γ cos2θ. Features of the STHF interactions in N−O−M chains with an M-ion in an orbital degenerate state are examplified by a preliminary analysis of N−O2−−V3+ chains in orthovanadites.
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Moskvin, A.S., Ovanesyan, N.S. & Trukhtanov, V.A. Supertransferred hyperfine interaction in magnetic insulators (II). Hyperfine Interact 5, 13–26 (1977). https://doi.org/10.1007/BF01021675
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DOI: https://doi.org/10.1007/BF01021675