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arXiv 1102.4284cond-mat.other
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T -> 0时的超流涡阵面:与参考系的解耦

Superfluid vortex front at T -> 0: Decoupling from the reference frame

J. J. Hosio, V. B. Eltsov, R. de Graaf, P. J. Heikkinen, R. Hanninen, M. Krusius, V. S. L'vov, G. E. Volovik

摘要:

在低温条件下,超流~ 3 He-B中产生了稳态湍流运动,其形式为湍流涡阵面,沿~ 3 He-B旋转圆柱形容器轴向运动,用等密度涡线代替无涡流动。我们提出了第一次测量的热信号从耗散作为时间的函数,记录在0.2 Tc的前运动期间,这是使用NMR技术监测。涡流动力学的测量和数值计算都表明,在低温下,传播的涡流的密度远低于平衡值,即超流体以比容器小的角速度旋转。这是超流体在零温极限下与容器参考系解耦的第一个证据。

英文摘要:

Steady-state turbulent motion is created in superfluid 3He-B at low temperatures in the form of a turbulent vortex front, which moves axially along a rotating cylindrical container of 3He-B and replaces vortex-free flow with vortex lines at constant density. We present the first measurements on the thermal signal from dissipation as a function of time, recorded at 0.2 Tc during the front motion, which is monitored using NMR techniques. Both the measurements and the numerical calculations of the vortex dynamics show that at low temperatures the density of the propagating vortices falls well below the equilibrium value, i.e. the superfluid rotates at a smaller angular velocity than the container. This is the first evidence for the decoupling of the superfluid from the container reference frame in the zero-temperature limit.

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