Negative ion motion in normal and superfluid /sup 3/He

Journal Article · Sun Jan 01 04:00:00 EST 1978 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00115525· OSTI ID:5087080

Ahonen, A I; Kokko, J; Paalanen, M A; Richardson, R C; Schoepe, W; Takano, Y

We report the first measurements of negative ion motion in the superfluid phases of /sup 3/He and in the normal phase below 17 mK. Refrigeration was achieved with nuclear demagnetization of copper and we used a pulsed NMR platinum powder thermometer immersed in the liquid. In the A phase the longitudinal resonance frequency provided an additional high-resolution thermometer. In the normal phase we observed a strictly temperature-independent mobility. In the superfluid phases we found two velocity regimes. For small applied electric fields the velocity is a linear function of the field and the corresponding mobility increases monotonically toward lower temperatures. At high electric fields the velocity is a nonlinear function of the field as a result of the pair-breaking effect of the moving ion. Available theoretical calculations are only in partial agreement with our results.

• Research Organization: Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland
• OSTI ID: 5087080
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 30:1; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRIC FIELDS
EVEN-ODD NUCLEI
HELIUM 3
HELIUM 3 A
HELIUM 3 B
HELIUM ISOTOPES
ION MOBILITY
ISOTOPES
LIGHT NUCLEI
MOBILITY
NUCLEI
PARTICLE MOBILITY
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
STABLE ISOTOPES
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE