One-dimensional textures and critical velocity in superfluid 3 He-A
One-dimensional textures and critical velocity in superfluid 3 He-A
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超流体 3 He-A 中的一维织构和临界速度
DOI：
10.1103/physrevb.62.12374
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发表时间：
2000
影响因子：
3.7
通讯作者：
E. Thuneberg
中科院分区：
文献类型：
--
作者：
J. Kopu;R. Hänninen;E. Thuneberg
本文从理论上研究了超流~ 3 He-A的流动稳定性。计算是用一维模型进行的，其中序参量只依赖于超流速度v_s方向上的坐标。我们集中讨论外磁场H垂直于v_s的情形，在这里只有很少的解析结果。我们计算了超流不稳定时的临界速度v_c。详细研究了v_c与温度和基本轨道织构l（r）的关系。研究了均匀织构和螺旋织构以及两种畴壁结构。所得结果与旋转圆柱体中的实验结果部分一致。
We study theoretically the stability of flow in superfluid 3He-A. The calculations are done using a one-dimensional model where the order parameter depends only on the coordinate in the direction of the superfluid velocity v_s. We concentrate on the case that the external magnetic field H is perpendicular to v_s, where only few results are available analytically. We calculate the critical velocity v_c at which the superflow becomes unstable against the formation of continuous vortices. The detailed dependence of v_c on the temperature and on the form of the underlying orbital texture l(r) is investigated. Both uniform and helical textures and two types of domain-wall structures are studied. The results are partially in agreement with experiments made in a rotating cylinder.