非经典转动惯量上限的探讨
Probing the Upper Limit of Nonclassical Rotational Inertia
摘要：
本文研究了在扭转振子中约束对固体4-He非经典转动惯量的影响。对于约100微米宽的环空，NCRI表现出20%的宽最大值。约束于多孔介质或较大几何形状的样品均具有较小的NCRI，大多低于约1%。此外，我们扩展金和陈的阻塞环实验的固体样品与大超固体分数。阻塞环抑制非经典去耦从17.1%低于我们的检测限0.8%。这一结果表明了超固体现象的非局域性。在20 mK，NCRI取决于速度的历史，显示在不同的薄环形细胞的一个封闭的磁滞回线。
英文摘要：
We study the effect of confinement on solid 4-He's nonclassical rotational inertia (NCRI) in a torsional oscillator by constraining it to narrow annular cells of various widths. The NCRI exhibits a broad maximum value of 20% for annuli of approximately 100 micrometer width. Samples constrained to porous media or to larger geometries both have smaller NCRI, mostly below about 1%. In addition, we extend Kim and Chan's blocked annulus experiment to solid samples with large supersolid fractions. Blocking the annulus suppresses the nonclassical decoupling from 17.1% below the limit of our detection of 0.8%. This result demonstrates the nonlocal nature of the supersolid phenomena. At 20 mK, NCRI depends on velocity history showing a closed hysteresis loop in different thin annular cells.
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