At two level anti-crossings of an NV center coupled to a first-shell 13C nuclear spin, selected transitions have zero first-order Zeeman shift, yielding 5-7 times longer T2* and single-component microwave transition amplitudes usable for vector field sensing.
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Level anti-crossings of an NV center in diamond: Decoherence-free subspaces and 3D sensors of microwave magnetic fields
At two level anti-crossings of an NV center coupled to a first-shell 13C nuclear spin, selected transitions have zero first-order Zeeman shift, yielding 5-7 times longer T2* and single-component microwave transition amplitudes usable for vector field sensing.