Mössbauer Study of Supertransferred Hyperfine Field of119Sn (Sn4+) in Ca1-xSrxMnO3

Ca 1- x Sr x Mn 0.99 Sn 0.01 O 3 (0≦ x ≦1) with (nearly) cubic perovskite structures were prepared and the magnetic hyperfine fields of 119 Sn(Sn 4+ ) were measured by the Mössbauer effect. The hyperfine fields arise from unpaired s electron spin densities transferred from Mn 4+ ions (super-transferred hyperfine interaction). The hyperfine field for a tin ion was found to depend linearly upon the numbers of Ca 2+ and Sr 2+ ions in the neighboring divalent cation sites, with proportional coefficients having opposite signs. To explain experimental results two kinds of spin transfer processes contributing to the hyperfine field oppositely to each other have been considered, and spin transfer via a divalent cation is emphasized particularly. The hyperfine field at 0 K for Sn 4+ in CaMnO 3 is -75 kOe, while +20 kOe for Sn 4+ in SrMnO 3 .