Specific heat of amorphous {sup 3}He films and confined liquid {sup 3}He

Journal Article · Wed Nov 01 04:00:00 EST 1995 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00753323· OSTI ID:183393

Golov, A; Pobell, F ^[1]

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1. Bayreuth Univ. (Germany)

We have measured the heat capacities of {sup 3}He films and liquid {sup 3}He in porous Vycor glass at 10 to 600 mK. With increasing the film thickness front 1 to 3 atomic layers , the specific heat evolves gradually from that typical to solid to that of liquid {sup 3}He. At about 2 atomic layers, however, its low-temperature part is nearly temperature-independent; we interpret this as a result of gradual freezing of spins in an amorphous solid {sup 3}He film with decreasing the temperature. The contribution of liquid {sup 3}He in the center of the Vycor pores can be described as the specific heat of bulk liquid {sup 3}He at corresponding pressures in the range 0 to 28 bar. The thickness of amorphous solid on the pore walls increases with external pressure roughly linearly. Preplating the walls with {sup 4}He allows to determine the positions of {sup 3}He atoms contributing to the surface specific heat at 10 to 50 mK. In addition, the contribution from the specific heat of {sup 3}He-{sup 4}He mixing at 100 to 600 mK is discussed as a function of pressure and amount of{sup 4}He.

• Sponsoring Organization: USDOE
• OSTI ID: 183393
• Report Number(s): CONF-950676--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 101; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
AMORPHOUS STATE
HELIUM 3
HELIUM 4
PRESSURE DEPENDENCE
SPECIFIC HEAT
THIN FILMS
VYCOR