Vibrating-wire measurements in vacuum, liquid {sup 3}He and liquid {sup 3}He-{sup 4}He mixtures

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00694064· OSTI ID:138565

Koenig, R; Esquinazi, P; Pobell, F ^[1]

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1. Univ. Bayreuth (Germany)

In order to overcome the 200{mu}K-barrier in the refrigeration of liquid {sup 3}He-{sup 4}He mixtures the authors have constructed an experimental cell using only pure materials to minimize possible origins for heat leaks into the liquid. With this arrangement they were able to cool a saturated 6.8%-mixture to a temperature of {le} 150{mu}K. A vibrating wire which was immersed in pure {sup 3}He floating on top of the phase-separated mixture was used as a thermometer. This wire was calibrated in a second experiment with pure {sup 3}He only in the cell. In superfluid {sup 3}He-B at T {le} 0.15 mK the damping of the wire due to the quasiparticles becomes very small, and they observe typical characteristics of the vacuum damping of the wire which was extensively examined before filling any liquid into the cell. 11 refs., 3 figs.

• Sponsoring Organization: USDOE
• OSTI ID: 138565
• Report Number(s): CONF-9206305--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 89; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COOLING
DAMPING
HEAT LOSSES
HELIUM 3 B
HELIUM II
MIXTURES
QUASI PARTICLES
TEMPERATURE MEASUREMENT
TEMPERATURE RANGE 0000-0013 K
VISCOSITY