Parametric generation of second sound by first sound in superfluid helium

被引：21

作者：

Rinberg, D ^{[1
]}

Cherepanov, V ^{[1
]}

Steinberg, V ^{[1
]}

机构：

[1] TEL AVIV UNIV,SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.76.2105

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first experimental observation of parametric generation of second sound (SS) by first sound (FS) in superfluid helium in a narrow temperature range in the vicinity of T-lambda. The temperature dependence of the threshold FS amplitude is found to be in a good quantitative agreement with theory [V. L. Pokrovskii and I.M. Khalatnikov, Sov. Phys. JETP 44, 1036 (1976)] and corrected for a finite geometry. Strong amplitude fluctuations and two types of the SS spectra are observed above the bifurcation. The latter effect is explained by the discreteness of the wave vector space and the strong temperature dependence of the SS dissipation length.

引用

页码：2105 / 2108

页数：4

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