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The wall potential in the pores of Vycor glass experienced by He-3 quasiparticles in a dilute He-3-He-4 solution.

Research output: Contribution to journalJournal article

Published

Journal publication date03/2002
JournalJournal of Low Temperature Physics
Journal number5-6
Volume126
Number of pages14
Pages1457-1470
Original languageEnglish

Abstract

We have studied the Fermi fluid, He-3 in (3)'He-(4) He solution, confined within the narrow channels of Vycor glass. Continuous wave NAIR signals were observed in two almost identical coils, one containing bulk solution and the other the solution in Vycor glass. Three different solutions (0.1, 1.6, and 6%) have been studied over the temperature range 3 mK to above I K The measurements relate to two exclusion effects of He-3 from Vycor glass. One concerns potential energy, and we demonstrate the partial exclusion of He-3 independent of concentration as the temperature is lowered from high temperatures down to around 200 mK, thus giving an experimental measure of the van der Waals forces between the wall and the helium. The second effect is the additional quantum exclusion which arises from the influence of quantum wire confinement on the kinetic energy, as the temperature is progressively lowered below 50 mK in the very dilute (0.1%) solution.