Investigation of persistent current states in rotating superfluid helium contained in superleak using doppler-shifted fourth sound. Technical rept
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).
- Research Organization:
- California Univ., Los Angeles (USA). Dept. of Physics
- OSTI ID:
- 7221535
- Report Number(s):
- AD-745316
- Country of Publication:
- United States
- Language:
- English
Similar Records
A study of the trapping of superfluid persistent currents in superleaks. Interim technical report
Propagation of sound in matter. Interim summary report, 1 October 1968-1 February 1982