119Sn Mössbauer spectroscopy of L′0.8L0.2Mn6Sn6 compounds (L′=Y, Gd, Tb; L=Gd-Tm, Lu)

In the HfFe6Ge6-type ferrimagnetic compounds L′0.8L0.2Mn6Sn6 (L′=Y, Gd, Tb; L=Gd-Tm, Lu), the Sn2e and Sn2c sites surrounded by one or three lanthanide atoms split into different sub-sites depending on their (L′, L) environment. 119Sn Mössbauer spectroscopy evidences different hyperfine fields characterizing these sub-sites. The field differences are used to evaluate the contributions of the lanthanide moment to the hyperfine field. The analysis suggests isotropic and anisotropic contributions of the spin number of the lanthanide moment and dipolar contributions arising from its gJJ value. The lanthanide contribution is used to estimate the contribution of the manganese moment alone. The results are consistent with previous 119Sn Mössbauer spectroscopy measurements performed on isotypic compounds.