Incommensurate and commensurate antiferromagnetic orders in the kagome compound UV 6 Sn 6
Résumé
We report on the synthesis of single crystals of the kagome compound, UV6Sn6, and present the results of magnetization, electrical resistivity, heat capacity, x-ray, and neutron diffraction experiments to characterize the structure and magnetic properties. UV6Sn6 crystallizes in a large supercell of the HfFe6Ge6 parent structure with an hexagonal symmetry in which some of the U atoms are shifted by c/2 in an ordered fashion. Below TN 1 ≈ 29 K, an incommensurate magnetic structure with a temperature-dependent wave vector (0, 0, kz ) is observed. Below TN 2 = 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 UV6Sn6 from its lanthanide-based analogs.
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