Bulk, site-resolved orbital Zeeman response in TbV₆Sn₆ revealed by ⁵¹V NMR

⁵¹V NMR on TbV6Sn6 in the ordered state (T < 4 K, μ₀H < 6 T) reveals a low-field, nonlinear Knight-shift component that cannot be accounted for by spin-only Zeeman physics or by paramagnetic-state baselines derived independently from bulk magnetometry [1–5]. The anomalous shift exhibits a reproducible low-field curvature in the Knight shift versus field, and it is strongest for fields along the c axis—the configuration in which an orbital-Zeeman response has been reported [6]. Together, these observations establish a bulk, site-resolved uniform orbital susceptibility at the vanadium site and provide the local-probe complement to momentum-resolved measurements of orbital magnetism in this kagome metal. A quantitative analysis of the Knight shift plotted against the bulk susceptibility constrains the transferred hyperfine coupling from terbium to vanadium. The data connect local-probe shifts to momentum-resolved observations, constraining Berry-curvature-enhanced orbital magnetism in kagome metals [7].

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