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Elastic effects in torsional oscillators containing solid helium

机译:含固态氦的扭转振荡器的弹性效应

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摘要

A number of recent experiments have used torsional oscillators to study the behavior of solid helium. The oscillator frequencies increased at temperatures below 200 mK, an effect attributed to decoupling of a fraction of the helium mass-the signature of a "supersolid" phase. However, helium's shear modulus also increases below 200 mK and the frequency of a torsional oscillator depends on its elastic properties, as well as on its inertia. In many experiments helium is introduced via a hole in the torsion rod, where its shear modulus contributes to the stiffness of the rod. In oscillators with relatively large torsion rod holes, changes in the helium's shear modulus could produce the entire low temperature frequency shifts that have been interpreted as mass decoupling. For these oscillators we also find that the known elastic properties of helium in the torsion rod can explain the observed TO amplitude dependence (which has been interpreted as a critical velocity) and the TO dissipation peak. However, in other oscillators these elastic effects are small and the observed frequency changes must have a different origin.
机译:最近的许多实验已使用扭转振荡器来研究固体氦的行为。振荡器频率在温度低于200 mK时增加,这归因于一部分氦质量的解耦-“超固相”的特征。但是,氦的剪切模量也会增加到200 mK以下,并且扭转振荡器的频率取决于其弹性和惯性。在许多实验中,都是通过扭杆中的一个孔引入氦气的,在那里它的剪切模量有助于杆的刚度。在具有较大扭杆孔的振荡器中,氦的剪切模量变化可能会产生整个低温频率偏移,这已被解释为质量解耦。对于这些振荡器,我们还发现扭杆中氦气的已知弹性特性可以解释观察到的TO振幅依赖性(已被解释为临界速度)和TO耗散峰。但是,在其他振荡器中,这些弹性效应很小,并且观察到的频率变化必须具有不同的原点。

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  • 来源
    《Physical review》 |2012年第18期|p.180501.1-180501.5|共5页
  • 作者单位

    Laboratoire de Physique Statistique de l'ENS, associe au CNRS et aux Universites Denis Diderot et P.M. Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France,Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2E1;

    Laboratoire de Physique Statistique de l'ENS, associe au CNRS et aux Universites Denis Diderot et P.M. Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France;

    Laboratoire de Physique Statistique de l'ENS, associe au CNRS et aux Universites Denis Diderot et P.M. Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France;

    Laboratoire de Physique Statistique de l'ENS, associe au CNRS et aux Universites Denis Diderot et P.M. Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France;

    Laboratoire de Physique Statistique de l'ENS, associe au CNRS et aux Universites Denis Diderot et P.M. Curie, 24 rue Lhomond, 75231 Paris Cedex 05, France;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    linear defects: dislocations, disclinations; anelasticity, internal friction, stress relaxation, and mechanical resonances;

    机译:线性缺陷:错位;错位;无弹性;内摩擦;应力松弛和机械共振;

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