Magnetic order and physical properties of the Kagome metal UNbSn
arXiv:2504.08913 · doi:10.1103/g26b-kkw7
Abstract
The family of materials ( = rare-earth, = transition metal, = Ga, Si, Ge, Sn) produces an array of emergent phenomena, such as charge density waves, intrinsic Hall effects, and complex magnetic order, due to its Kagome net of transition metal atoms, its local-moment magnetic anisotropies, and its extensive chemical tunability. Here, we report a new ``166" material containing both an actinide (uranium) and a 4 transition metal (niobium) to investigate the properties of a 5-4 electron 166 system. UNbSn crystallizes in the hexagonal 6/ space group with a small degree of disorder due to shifts in the size of the CoSn-like cages along the axis. Upon cooling at zero magnetic field, the material undergoes two magnetic phase transitions at = 46 K and = 43 K. The low-temperature, zero-field phase is an antiferromagnet with ordered uranium moments and a =(0,0,1/2) propagation vector determined by neutron diffraction. Remarkably, with a magnetic field applied along the axis, five additional magnetic transitions occur, evidenced by magnetization and resistivity data, before the moment saturates at 2.62 /U at 2 K and 13.6 T. In two magnetic phase regions, the Hall resistivity of UNbSn significantly deviates from the magnetization, suggesting that the phases have a large Berry curvature or a change in the Fermi surface. The unknown magnetic ordering of the field-dependent phases of UNbSn demonstrates the complexity of the 5-4 166 system and encourages further study of its properties.
28 pages, 23 figures
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