119Sn Mössbauer spectroscopy of Gd0.8L0.2Mn6Sn6 and Tb0.8L0.2Mn6Sn6 compounds (L=Sc, Y, Lu)

► We use substituted compounds to perturb the coordination of the Sn atoms. ► We measure the 119Sn Mössbauer hyperfine parameters of the different tin sub-sites. ► We analyze the contribution of the lanthanide moment to the 119Sn hyperfine fields. ► The hyperfine fields are correlated to the size of the substituting element. ► There are isotropic and anisotropic contributions to the transferred hyperfine field.