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If the magnetic field strength at the nucleus increases similarly to the zeeman effect, I expect the level splitting to increase. It doesn’t quite seem to explain why the existing peaks at 50K get deeper at 18K because one would expect them to shift.
Why the field strength at the nucleus increases at lower temperatures might be understood by the ising model , regions of alligned spins getting bigger and the magnetic field within a region stronger (although not sure since if we only consider neirest neighbour interactions and all its neighbours are alligned then the field strength seems saturated and the maximal field strength independ on the size of a region). Remark that if the magnetic field at the nuclei is assumed to be mostly dependent on its neighbours , then the absorption spectrum of a sample reflects the fraction of alligned regions within that sample, the absorption to increase as there are more alligned zones, maybe that is the reason for the deepening.
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