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arXiv 1306.5783cond-mat.supr-con
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拉伸气凝胶中超流~ 3 He-A中Angular Momentum的取向

Orientation of the Angular Momentum in Superfluid 3He-A in a Stretched Aerogel

J. I. A. Li, A. M. Zimmerman, J. Pollanen, C. A. Collett, W. J. Gannon, W. P. Halperin

摘要:

超流3 He-A在一个充分表征的拉伸气凝胶,在以前的工作中使用[1],已经研究了平行和垂直方向的磁场相对于各向异性轴的气凝胶。同时,我们发现等自旋配对态(ESP)稳定到最低温度。从我们的脉冲NMR频率偏移作为温度和顶角的函数,轨道角动量l的取向已被确定。由单轴拉伸引入的气凝胶各向异性倾向于在平行于应变轴的轴向状态下对齐l,这证实了Sauls [2]提出的理论,并且与Volovik [3]基于Rainer和Vuorio [4]的杂质计算的预测相反。

英文摘要:

Superfluid 3He-A in a fully characterized stretched aerogel, used in previous work [1], has been studied for parallel and perpendicular orientations of the magnetic field relative to the anisotropy axis of the aerogel. Consistently, we find that an equal spin pairing state (ESP) is stabilized down to the lowest temperature. From our pulsed NMR frequency shifts as a function of temperature and tip angle, the orientation of the orbital angular momentum l has been determined. The aerogel anisotropy introduced by uniaxial stretching tends to align l in the axial state parallel to the strain axis, confirming the theory proposed by Sauls [2] and contrary to the prediction of Volovik [3] based on an impurity calculation of Rainer and Vuorio [4].

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