Experimental evidence for lattice instability of potassium at low temperatures
- 15 March 1988
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 37 (8), 4258-4260
- https://doi.org/10.1103/physrevb.37.4258
Abstract
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.Keywords
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