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Interplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He

Using a high-sensitivity torsional oscillator (TO) technique, we mapped the rotational and relaxational dynamics of solid helium-4 (4He) throughout the parameter range of the proposed supersolidity. We found evidence that the same microscopic excitations controlling the torsional oscillator motions... Full description

Journal Title: Science (Washington) May 13, 2011, Vol.332(6031), pp.821-824
Main Author: Pratt, E
Other Authors: Hunt, B , Gadagkar, V , Yamashita, M , Graf, Mj , Balatsky, A , Davis, J
Format: Electronic Article Electronic Article
Language: English
Subjects:
Quelle: © ProQuest LLC All rights reserved
ID: ISSN: 0036-8075
Link: http://search.proquest.com/docview/907940253/?pq-origsite=primo
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title: Interplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He
format: Article
creator:
  • Pratt, E
  • Hunt, B
  • Gadagkar, V
  • Yamashita, M
  • Graf, Mj
  • Balatsky, A
  • Davis, J
subjects:
  • Indication
  • Stimulation
  • Critical Velocity
  • Oscillators
  • Excitation
  • Shear Modulus
  • Dynamics
  • Rotational
  • Miscellaneous Sciences (So)
ispartof: Science (Washington), May 13, 2011, Vol.332(6031), pp.821-824
description: Using a high-sensitivity torsional oscillator (TO) technique, we mapped the rotational and relaxational dynamics of solid helium-4 (4He) throughout the parameter range of the proposed supersolidity. We found evidence that the same microscopic excitations controlling the torsional oscillator motions are generated independently by thermal and mechanical stimulation. Moreover, a measure for the relaxation times of these excitations diverges smoothly without any indication for a critical temperature or critical velocity of a supersolid transition. Finally, we demonstrated that the combined temperature-velocity dependence of the TO response is indistinguishable from the combined temperature-strain dependence of the solid's shear modulus. This implies that the rotational responses of solid 4He attributed to supersolidity are associated with generation of the same microscopic excitations as those produced by direct shear strain.
language: eng
source: © ProQuest LLC All rights reserved
identifier: ISSN: 0036-8075
fulltext: no_fulltext
issn:
  • 00368075
  • 0036-8075
url: Link


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titleInterplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He
creatorPratt, E ; Hunt, B ; Gadagkar, V ; Yamashita, M ; Graf, Mj ; Balatsky, A ; Davis, J
contributorPratt, E (correspondence author)
ispartofScience (Washington), May 13, 2011, Vol.332(6031), pp.821-824
identifierISSN: 0036-8075
subjectIndication ; Stimulation ; Critical Velocity ; Oscillators ; Excitation ; Shear Modulus ; Dynamics ; Rotational ; Miscellaneous Sciences (So)
descriptionUsing a high-sensitivity torsional oscillator (TO) technique, we mapped the rotational and relaxational dynamics of solid helium-4 (4He) throughout the parameter range of the proposed supersolidity. We found evidence that the same microscopic excitations controlling the torsional oscillator motions are generated independently by thermal and mechanical stimulation. Moreover, a measure for the relaxation times of these excitations diverges smoothly without any indication for a critical temperature or critical velocity of a supersolid transition. Finally, we demonstrated that the combined temperature-velocity dependence of the TO response is indistinguishable from the combined temperature-strain dependence of the solid's shear modulus. This implies that the rotational responses of solid 4He attributed to supersolidity are associated with generation of the same microscopic excitations as those produced by direct shear strain.
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titleInterplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He
descriptionUsing a high-sensitivity torsional oscillator (TO) technique, we mapped the rotational and relaxational dynamics of solid helium-4 (4He) throughout the parameter range of the proposed supersolidity. We found evidence that the same microscopic excitations controlling the torsional oscillator motions are generated independently by thermal and mechanical stimulation. Moreover, a measure for the relaxation times of these excitations diverges smoothly without any indication for a critical temperature or critical velocity of a supersolid transition. Finally, we demonstrated that the combined temperature-velocity dependence of the TO response is indistinguishable from the combined temperature-strain dependence of the solid's shear modulus. This implies that the rotational responses of solid 4He attributed to supersolidity are associated with generation of the same microscopic excitations as those produced by direct shear strain.
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abstractUsing a high-sensitivity torsional oscillator (TO) technique, we mapped the rotational and relaxational dynamics of solid helium-4 (4He) throughout the parameter range of the proposed supersolidity. We found evidence that the same microscopic excitations controlling the torsional oscillator motions are generated independently by thermal and mechanical stimulation. Moreover, a measure for the relaxation times of these excitations diverges smoothly without any indication for a critical temperature or critical velocity of a supersolid transition. Finally, we demonstrated that the combined temperature-velocity dependence of the TO response is indistinguishable from the combined temperature-strain dependence of the solid's shear modulus. This implies that the rotational responses of solid 4He attributed to supersolidity are associated with generation of the same microscopic excitations as those produced by direct shear strain.
urlhttp://search.proquest.com/docview/907940253/
date2011-05-13