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Preliminary measurements of Andreev reflection of quasiparticles by turbulence in superfluid He-3.

Research output: Contribution to journalJournal article

Published

Journal publication date07/2001
JournalJournal of Low Temperature Physics
Journal number1-2
Volume124
Number of pages10
Pages113-122
Original languageEnglish

Abstract

We present preliminary measurements of Andreev scattering of quasiparticles from turbulence in the B-phase of superfluid He-3-B. The turbulence is generated by a vibrating wire resonator driven above its pair-breaking critical velocity. The vortices intercept a beam of quasiparticles generated by a nearby black-body radiator. A substantial fraction of the incident quasiparticles are retro-reflected back into the radiator by Andreev scattering processes. The resulting temperature rise within the radiator provides a direct measurement of the flux of quasiparticles Andreev reflected. The technique provides a sensitive probe of superfluid turbulence in the ultra-low temperature regime.