Acoustic Spectroscopy of Superfluid 3He in Aerogel in the Presence of a Magnetic Field |
| |
| Authors: | E Nazaretski G Lawes D M Lee N Mulders D Ponarin J M Parpia |
| |
| Affiliation: | (1) Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY, 14853;(2) Department of Physics and Astronomy, University of Delaware, Newark, Delaware |
| |
| Abstract: | We have constructed a silver alloy cell to investigate low frequency sound propagation in
3
He-filled aerogel at various magnetic fields. In this apparatus, two sound modes were observed in the superfluid phase. We observed both the first sound-like mode (fast mode) which is a compression wave also seen in the normal state and the second sound-like mode (slow mode) which is attributed to the out-of-phase oscillation of the superfluid and normal components of
3
He clamped to the aerogel matrix. The values of Tc and  s can be extracted from the analysis of these two modes. In addition, a Helmholtz resonance provides an in-situ signature of the bulk superfluid transition and allows us to also determine the bulk s. By measuring these quantities over a range of applied magnetic fields we hope to explore the P, T, H phase diagram of
3
He in aerogel. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
