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arXiv 0905.0353cond-mat.supr-concond-mat.other
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各向异性诱导气凝胶中超流~ 3 He的涡核转变

Anisotropy-induced Vortex Core Transitions in Superfluid 3He in Aerogel

Kazushi Aoyama, Ryusuke Ikeda

摘要:

通过数值求解微观Ginzburg-Landau方程,研究了单轴压缩和拉伸气凝胶中超流3 He类A相和类B相单涡核结构.研究发现,尽管具有轴向配对的类A相在任何单轴变形下都能扩展,但气凝胶中两相中的涡核状态高度依赖于气凝胶的变形类型:在压缩气凝胶中,在任何压力下,类B相都出现了体相B中的一级涡核转变(VCT),而类A相则没有出现奇怪的涡核.相比之下,在拉伸的气凝胶中,类B相的VCT丢失,而另一个VCT预计将发生在非单一芯和类A相的极性芯之间。对这些结果的实验研究希望了解超流$^3$ He和气凝胶结构之间的相关性。

英文摘要:

Core structures of a single vortex in A-like and B-like phases of superfluid 3He in uniaxially compressed and stretched aerogels are studied by numerically solving Ginzburg-Landau equations derived microscopically. It is found that, although the A-like phase with axial pairing is extended by any uniaxial deformation, the vortex core states in the two phases depend highly on the type of deformation in aerogel: In a compressed aerogel, the first order vortex core transition (VCT) previously seen in the bulk B phase appears at any pressure in B-like phase, while no strange vortex core is expected in A-like phase. By contrast, in a stretched aerogel, the VCT in B-like phase is lost, while another VCT is expected to occur between a nonunitary core and the polar one in A-like phase. An experimental search for these results is hoped to understand correlation between superfluid $^3$He and aerogel structures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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