Absence of low temperature anomaly in the Debye-Waller factor of solid He-4

Blackburn, E.; Goodkind, J. M.; Sinha, S. K.; Hudis, J.; Broholm, C.; van Duijn, J.; Frost, C. D.; Kirichek, O.; Down, R. B. E.

Absence of low temperature anomaly in the Debye-Waller factor of solid He-4

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Description

The mean square atomic displacement in hcp-phase solid He-4 has been measured in crystals with a molar volume of 21.3 cm^3. It is temperature independent from 1 K to 140 mK, with no evidence for an anomaly in the vicinity of the proposed supersolid transition. The mean square displacement is different for in-plane motions (0.122 +/- 0.001 A^(2)) and out-of-plane motions (0.150 +/- 0.001 A ^(2)).
4 figures, 4 tables. Updated version with publication information