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ZhETF, Vol. 146, No. 6, p. 1222 (December 2014)
(English translation - JETP, Vol. 119, No. 6, p. 1069, December 2014 available online at )

Eltsov V.B., Hosio J.J., Krusius M., Makinen J.T.

Received: June 16, 2014

DOI: 10.7868/S0044451014120074

DJVU (820.3K) PDF (1053.3K)

Andreev reflection of quasiparticle excitations from quantized line vortices is reviewed in the isotropic B phase of superfluid 3 He in the temperature regime of ballistic quasiparticle transport at T \leq 0.20T_{c}. The reflection from an array of rectilinear vortices in solid-body rotation is measured with a quasiparticle beam illuminating the array mainly in the orientation along the rotation axis. The result is in agreement with the calculated Andreev reflection. The Andreev signal is also used to analyze the spin-down of the superfluid component after a sudden impulsive stop of rotation from an equilibrium vortex state. In a measuring setup where the rotating cylinder has a rough bottom surface, annihilation of the vortices proceeds via a leading rapid turbulent burst followed by a trailing slow laminar decay, from which the mutual friction dissipation can be determined. In contrast to the currently accepted theory, it is found to have a finite value in the zero-temperature limit: \alpha (T \rightarrow 0) = (5 \pm 0.5) \cdot 10^{-4}. Contribution for the JETP special issue in honor of A. F. Andreev's 75th birthday}

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