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arXiv 1208.2648cond-mat.supr-con
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超流~ 3 He中的非线性场依赖和f波相互作用

Nonlinear field-dependence and f-wave interactions in superfluid 3He

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

摘要:

本文介绍了超流^{3}He-B在高达0.11 T磁场下的横向声学研究结果。利用声腔干涉法,我们观察到沿磁场传播的横向声波的声法拉第效应,我们测量到的法拉第旋转的偏振高达1710^{ \circ }。我们使用这些结果来确定塞曼分裂的虚压缩模式,一个序参量集体模式与总角动量J=2。我们表明,在f波通道的配对相互作用是有吸引力的压力为P=6巴。我们还报告了法拉第旋转的非线性场依赖性的频率基本上高于模式频率不占在理论的横向声学色散关系制定的频率附近的模式。因此,我们已经确定了该理论的有效性区域,使我们能够对早期工作中进行的法拉第旋转实验的分析进行校正。

英文摘要:

We present results of transverse acoustics studies in superfluid ^{3}He-B at fields up to 0.11 T. Using acoustic cavity interferometry, we observe the Acoustic Faraday Effect for a transverse sound wave propagating along the magnetic field, and we measure Faraday rotations of the polarization as large as 1710^{\circ}. We use these results to determine the Zeeman splitting of the Imaginary Squashing mode, an order parameter collective mode with total angular momentum J=2. We show that the pairing interaction in the f-wave channel is attractive at a pressure of P=6 bar. We also report nonlinear field dependence of the Faraday rotation at frequencies substantially above the mode frequency not accounted for in the theory of the transverse acoustic dispersion relation formulated for frequencies near the mode. Consequently, we have identified the region of validity of the theory allowing us to make corrections to the analysis of Faraday rotation experiments performed in earlier work.

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