{sup 4}He films in Millipore filters. A calorimetric study

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

OSTI ID:243827

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

The authors report the first systematic heat capacity measurement for {sup 4}He films adsorbed in Millipore filters using an AC calorimetric technique. Millipore is a three dimensionally interconnected fibrous filter material with 0.05 {mu}m nominal pore size. The authors have studied helium films of thickness starting from submonolayer up to and including superfluid films between 0.1 and 1 K. At first, a heat capacity bump develops for submonolayer coverages. It shifts to lower temperature with increasing thickness. It disappears and gives way to a heat capacity peak. It grows and moves to higher temperatures for thicker films. This behavior is quite similar to that found in the nearly cylindrical non-interconnected pores of Anopore membranes. However, this peak is seen over a wider range of thickness and temperature than in Anopore. Comparing with the Cornell superfluid density results, the peak temperature position is clearly above the superfluid transition.

• OSTI ID: 243827
• 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
FILMS
FILTERS
HELIUM 4
SPECIFIC HEAT
TEMPERATURE RANGE 0000-0013 K
THICKNESS