Investigation of Persistent Current States in Rotating Superfluid Helium Contained in Superleak Using Doppler-Shifted Fourth Sound.
CALIFORNIA UNIV LOS ANGELES DEPT OF PHYSICS
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Fourth sound techniques were extensively developed into a powerful tool for investigating persistent current states in rotating superfluid helium contained in a superleak. Unique features of these techniques are 1 persistent superfluid component velocity is directly determined by the Doppler-shifted splitting of a fourth sound resonant mode in an annular cavity 2 the superfluid component density is determined simultaneously and independently by measuring the velocity of fourth sound 3 persistent current states are observed from a rotating frame. The fourth sound techniques allows observations of persistent current states which are otherwise inaccessible in a stationary measurement. As a consequence the authors show that every phenomenon observed in rotating locked superfluid helium Bose superfluid has an analogous counterpart in an irreversible type-II superconductor Fermi superfluid. Author
- Physical Chemistry