4.8 Article

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

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SCIENCE
卷 332, 期 6031, 页码 821-824

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AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1203080

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  1. National Science Foundation [DMR-0806629, NSF PHY05-51164]
  2. U.S. Department of Energy [DE-AC52-06NA25396]
  3. Laboratory Directed Research and Development program
  4. Direct For Mathematical & Physical Scien
  5. Division Of Materials Research [0806629] Funding Source: National Science Foundation

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Using a high-sensitivity torsional oscillator (TO) technique, we mapped the rotational and relaxational dynamics of solid helium-4 (He-4) 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 He-4 attributed to supersolidity are associated with generation of the same microscopic excitations as those produced by direct shear strain.

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