Low-temperature shear modulus changes in solid (4)He and connection to supersolidity.

Low-temperature shear modulus changes in solid (4)He and connection to supersolidity. Research Abstract Details 

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Low-temperature shear modulus changes in solid (4)He and connection to supersolidity. Abstract Text:

James Day,John Beamish,James Day,John Beamish,James Day,John Beamish,

Superfluidity-liquid flow without friction-is familiar in helium. The first evidence for 'supersolidity', its analogue in quantum solids, came from torsional oscillator measurements involving (4)He. At temperatures below 200 mK, the torsional oscillator frequencies increased, suggesting that some of the solid decoupled from the oscillator. This behaviour has been replicated by several groups, but solid (4)He does not respond to pressure differences, and persistent currents and other signatures of superflow have not been seen. Both experiments and theory indicate that defects are involved; these should also affect the solid's mechanical behaviour. Here we report a measurement of the shear modulus of solid (4)He at low frequencies and strains. We observe large increases below 200 mK, with the same dependence on measurement amplitude, (3)He impurity concentration and annealing as the decoupling seen in the torsional oscillator experiments. We explain this unusual elastic behaviour in terms of a dislocation network that is pinned by (3)He at the lowest temperatures but becomes mobile above 100 mK. The frequency changes in the torsional oscillator experiments appear to be related to the motion of these dislocations, perhaps by disrupting a possible supersolid state.

Low-temperature shear modulus changes in solid (4)He and connection to supersolidity. Publishing Authors By Initials

J Day,J Beamish,J Day,J Beamish,J Day,J Beamish,

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Low-temperature shear modulus changes in solid (4)He and connection to supersolidity. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Nature

VOLUME: 450

Page Numbers: 853-6

Journal Abbreviation: Nature

ISSN: 1476-4687

DAY: 6

MONTH: Dec

YEAR: 2007

Low-temperature shear modulus changes in solid (4)He and connection to supersolidity. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Low-temperature shear modulus changes in solid (4)He and connection to supersolidity.

AFFILIATION: Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2G7 Canada.

Country: England

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MEDLINETA: Nature

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