[Publication] Magnetic structures of Mn-rich and of Fe-rich TmMn6-xFexSn6 stannides with (Mn,Fe) kagome networks and related 119Sn hyperfine magnetic fields

Friday, April 8, 2022 - 12:28

Our researchers have led a comprehensive analysis of the giant and anisotropic 119Sn hyperfine fields in TmMn6-xFexSn6. These materials belong to the kagome magnets family that is the subject of an intense research activity due to topological properties. This is Gerard Venturini’s last publication (passed away on February 13, 2019), which he started writing and which was finished by his co-authors

The ¹¹⁹Sn hyperfine fields in TmMn_6-xFe_xSn₆ are analyzed based on a model of vectorial hyperfine fields. Both the isotropic and anisotropic contributions to the total hyperfine field are taken into account. The former is due to the finite 5s spin density at the nucleus (Fermi contact term), the latter arises from the anisotropy in the 5p spin density.

The Fe for Mn substitution yields changes in the magnetic structure and magnetic moments orientation, as revealed by neutron diffraction, which provides a large set of data allowing us to gain quantitative information on both the isotropic and anisotropic contributions.

The model might be used to analyze transferred hyperfine fields in other materials, including kagome magnets.

Reference :

Title : Magnetic structures of Mn-rich and of Fe-rich TmMn_6-xFe_xSn₆ stannides with (Mn,Fe) kagome networks and related ¹¹⁹Sn hyperfine magnetic fields

Authors : Gérard Venturini, Bernard Malaman, Gérard Le Caër, and Thomas Mazet

Journal : Physical Review B

Date of publication (online) : November 2021

Link : https://journals.aps.org/prb/abstract/10.1103/PhysRevB.104.184433

Image caption : Kagome network