An Er3+ spin sensor in CaWO4 measures the hyperfine NMR spectrum of a single 93Nb nuclear spin-9/2 with Hertz resolution, determining its site, position, quadrupolar tensor, and two new terms in the spin Hamiltonian.
For that, we rely on the finding (see main text) that one of the principal axis of the quadrupole (Z) lies along the crystalline c-axis
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Precision hyperfine spectroscopy of an individual nuclear-spin-9/2
An Er3+ spin sensor in CaWO4 measures the hyperfine NMR spectrum of a single 93Nb nuclear spin-9/2 with Hertz resolution, determining its site, position, quadrupolar tensor, and two new terms in the spin Hamiltonian.