Year: 2025
Type: preprint
Abstract: alpha-UTe3, a van der Waals (vdW) actinide compound with a monoclinic ZrSe3-type structure, is a narrow-gap semiconductor with 5f moments. 125Te NMR reveals strongly anisotropic, layer-confined spin fluctuations below about 20 K, with the a-axis component enhanced, and a signal wipeout at the antiferromagnetic (AFM) transition at TN = 5 K. Single-crystal neutron diffraction finds q approx. (0.17, 0.5, 0) and a longitudinal sinusoidal modulation of a-axis moments (amplitude about 0.8 muB) with AFM stacking along b. A CEF singlet-singlet induced-moment framework accounts for the easy-axis anisotropy, the small heat-capacity anomaly at TN, the reduced ordered moment, and the exchange-driven selection of q in this localized 5f vdW magnet, establishing a constrained exchange geometry stabilizing this in-plane incommensurate state.
Source: arXiv (Cornell University)
DOI: 10.1103/jls4-6s89
Authors: Sakai, H., Tabata, C., Kaneko, K., Tokiwa, Y., Kitazawa, T., Kambe, S., Tokunaga, Y., Haga, Y.
Institutions: Japan Atomic Energy Agency, Advanced Science Research Center
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Pioneering of neutron spin polarization material science, G2599640765, Discovering novel physical properties through evaluation of local electronic Structure in f-electron systems with multiple chalcogens using high-quality single crystals, Collaborative Study Between Japan and the U.S. on f-Electron Chalcogenides' Properties under High Magnetic Fields, G5595122245, ウラン同位体をプローブとする物性研究の開拓, Search for novel topological quantum phases and elucidation of their electronic structures using multiple degrees of freedom in heavy electron systems
OpenAlex ID: W7091187646
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