Experimental evidence is presented for a tendency towards a lattice instability in potassium at low temperatures by neutron scattering techniques. The main result is the observation of a Huang diffuse scattering below 70 K in the vicinity of the (110) and (220) bcc Bragg reflections. Furthermore, the transverse-acoustic-phonon branch in the [110] direction with polarization [110] shows a softening of a few percent between 100 and 4 K, similar to Na and Li.
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Blaschko et al. (1988) studied this question.
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