For pt. I see ibid., vol.20, p.797 (1987). The second-order Zeeman shift in the nuclear electric quadrupole resonance at 993.4 kHz of 51 V in HoVO 4 is used to probe the enhanced nuclear antiferromagnetic ordered state of the 165 Ho moments below 5 mK.
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Bleaney et al. (1987) studied this question.
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