Specific heat studies of {sup 3}He, {sup 4}He and {sup 3}He-{sup 4}He mixture films in cylindrical cavities

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Bulletin of the American Physical Society

OSTI ID:243828

Steele, L M; Yeager, C J; Finotello, D

Using an AC calorimetry technique, the authors have performed a systematic specific heat study for {sup 3}He and {sup 4}He films adsorbed in the 0.2 {mu}m cylindrical pores of Anopore membranes. The specific heat submonolayer up to multilayer coverages of {sup 3}He and {sup 4}He films was studied in the temperature range 0.1-1.0 K. For low coverages, common specific heat behavior is found for both {sup 3}He and {sup 4}He films. At thicker coverages, a growing peak, shifting to higher temperatures, is found in {sup 4}He films. It is not present in {sup 3}He film studies. The nature of the {sup 4}He peak was probed by adding small doses of {sup 3}He. Mixture films with {sup 3}He concentrations ranging between 0.4 and 530% were thus studied in the same temperature range. It is found that the specific heat peak decreases in size becomes narrower and shifts to lower temperature as a function of {sup 3}He concentration. It eventually disappears at the highest concentration. The authors believe that this peak is related to the superfluid properties of the {sup 4}He films.

• OSTI ID: 243828
• Report Number(s): CONF-9304297--; CNN: Grant DMR 90-13979
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 38; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BINARY MIXTURES
HELIUM 3
HELIUM 4
MEMBRANE PORES
SPECIFIC HEAT
SUPERFLUIDITY
THICKNESS
THIN FILMS