Incommensurate and commensurate antiferromagnetic orders in the kagome compound UV${}_6$Sn${}_6$

Abstract

We report on the synthesis of single crystals of the kagome compound, UV${}_6$Sn${}_6$, and present the results of magnetization, electrical resistivity, heat capacity, x-ray, and neutron diffraction experiments to characterize the structure and magnetic properties. UV${}_6$Sn${}_6$ crystallizes in a large supercell of the HfFe${}_6$Ge${}_6$ parent structure with an hexagonal symmetry in which some of the U atoms are shifted by $c/2$ in an ordered fashion. Below $T_{N1}\approx$ 29 K, an incommensurate magnetic structure with a temperature-dependent wave vector $(0,0,k_z)$ is observed. Below $T_{N2}=$ 23.5 K, the wave vector locks in to $(0,0,0.5)$, forming an antiferromagnetic ground state. The U moments align along the $c$ axis retaining a large magnetic anisotropy. These findings highlight the role of the $5f$ orbitals from uranium in this structural family in driving both magnetic ordering and structural modulation and distinguish UV${}_6$Sn${}_6$ from its lanthanide-based analogs.

13 pages, 12 figures. v3: fixed typos, text improvements

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Cited by in corpus (2)

• Magnetic order and physical properties of the Kagome metal UNb${}_6$Sn${}_6$
• Structural modulation, physical properties, and electronic band structure of the kagome metal UCr${}_6$Ge${}_6$