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Influence of elastic deformations on the supersolid transition

机译:弹性变形对超固相变的影响

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摘要

We study within the Ginzburg-Landau (GL) theory of phase transitions how elastic deformations in a supersolid lead to local changes in the supersolid transition temperature. The GL theory is mapped onto a Schrodinger-type equation with an effective potential that depends on local dilatory strain. The effective potential is attractive for local contraction and repulsive for local expansion. Different types of elastic deformations are studied. We find that a contraction (expansion) of the medium that may be brought about by either externally applied or internal strain leads to a higher (lower) transition temperature as compared to the unstrained medium. In addition, we investigate edge dislocations and illustrate that the local transition temperature may be increased in the immediate vicinity of the dislocation core. We remark on the effects of shear screening induced by dislocation motion. Our analysis is not limited to supersolidity. Similar strain effects should also play a role in superconductors. Non-uniformly strained superconductors may thus exhibit a similar distribution of smeared local transition temperatures.
机译:我们在Ginzburg-Landau(GL)相变理论中研究了超固体中的弹性变形如何导致超固体转变温度的局部变化。 GL理论被映射到具有取决于局部扩张应变的有效电势的Schrodinger型方程式。有效潜力对局部收缩具有吸引力,而对局部扩展则具有排斥力。研究了不同类型的弹性变形。我们发现,与未应变的介质相比,介质的收缩(膨胀)可能是由外部施加的应变或内部应变引起的,从而导致较高(较低)的转变温度。另外,我们研究了边缘位错,并说明了位错核心附近的局部转变温度可能会升高。我们评论了位错运动引起的剪切筛选的影响。我们的分析不仅限于超实体。类似的应变效应也应在超导体中发挥作用。因此,非均匀应变的超导体可能会表现出类似的涂抹局部过渡温度分布。

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  • 来源
    《Physical review》 |2011年第17期|p.174304.1-174304.9|共9页
  • 作者单位

    Department of Physics, Washington University, Saint Louis, Missouri 63160, USA,Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA,Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA;

    Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA,Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    Department of Physics, Washington University, Saint Louis, Missouri 63160, USA;

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