Pac studies of spin deviations, pressure induced hyperfine field shifts, and temperature variation of supertransferred hyperfine fields

Abstract

A PAC study of111Cd substiuted antiferromagnetic transition metal salts is reported. Supertransferred hyperfine fields at111Cd nuclei were used for the first time to observe three effects: zero-point spin deviations, temperature variation, and pressure shift of the hyperfine field. Comparison of KNiF3 and RbMnF3 with their corresponding quadraticlayer fluorides K2NiF4 and Rb2MnF4 yields an estimate for the magnitude of the zeropoint spin deviation in doped antiferromagnets. The temperature dependences of the Cd hyperfine fields in RbMnF3/Cd and MnF2/Cd have been determined. The shift in hyperfine field observed for α-MnS/Cd under external pressure further supports our model for the origin of the supertransferred hyperfine fields.