Heat capacity studies of superfluid films on hydrogen preplated milliport

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Bulletin of the American Physical Society

OSTI ID:375054

Yeager, C; Finotello, D

The author presents heat capacity measurements for thin {sup 4}He films absorbed on a hydrogen preplated surface. The bare substrate used in this study was Millipore fibrous filter paper. Films were studied over temperatures between .2 and 1.0 K on hydrogen surfaces of two different thickness (approximately 20 and 37 {mu}mole/m{sup 2}). For both surfaces, a round heat capacity peak shifting to higher temperatures with increasing film thickness is found. A similar feature was previously observed in bare Millipore; the round peak has been interpreted as a reflection of the Kosterlitz-Thouless transition in 2D superfluid films. With hydrogen preplating, the peak appears at a lower helium coverage than an equivalent bare film peak at the same temperature. The peak is shifted 5{mu}mole/m{sup 2} for the first hydrogen surface while the second hydrogen surface induced a shift of 20 {mu}mole/m{sup 2}, corresponding to a coverage of about 1/3 of a layer.

• OSTI ID: 375054
• Report Number(s): CONF-9304297--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 40; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELIUM 4
HYDROGEN
POROUS MATERIALS
SPECIFIC HEAT
TEMPERATURE RANGE 0000-0013 K
THIN FILMS