Superfluidity in sup 3 He- sup 4 He mixture films

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5911963

Tiwari, R

Superfluid density and dissipation have been measured as functions of temperature in {sup 3}He-{sup 4}He mixture films using a high-Q torsional oscillator. A temperature range between 1.3K and 1.9K was scanned. {sup 3}He concentrations were as small as .5% and extended up to 56% in the thickest films. Thick pure {sup 4}He films were also investigated using the same technique. In mixture films the superfluid transition temperature decreases monotonically with {sup 3}He concentration. This decrease is linear for smaller concentrations but becomes more rapid at higher concentrations. There are no signs of a phase separation. All the mixture films exhibit the characteristic universal jump in superfluid density at the transition. This universality is not seen in very thick pure {sup 4}He films.

• Research Organization: Rutgers--the State Univ., New Brunswick, NJ (USA)
• OSTI ID: 5911963
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DENSITY
DISPERSIONS
ENERGY LOSSES
EVEN-EVEN NUCLEI
FILMS
FLUIDS
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
LOSSES
MIXTURES
NUCLEI
PHYSICAL PROPERTIES
QUANTITY RATIO
QUANTUM FLUIDS
STABLE ISOTOPES
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE