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. - Highlights: • We use substituted compounds to modify the magnetic environment 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 contribution depends on the spin number and gJJ value of the lanthanide moment. • There are isotropic and anisotropic contributions to the transferred hyperfine field