Since freezing is suppressed in small pores such as those of Vycor, superfluidity occurs at substantially higher pressures than in bulk 4He. Ultrasonic measurements show that the amount of superfluid in the pores does not decrease until freezing begins at a pressure of about 36 bar. At slightly high
✦ LIBER ✦
Reduction of rounding in the4He—Vycor superfluid transition with improved Vycor samples
✍ Scribed by R.V. Robinson; R. Jochemsen; J.D. Reppy
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 151 KB
- Volume
- 194-196
- Category
- Article
- ISSN
- 0921-4526
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A simultaneous measurement of the heat capacity and superfluid density of thin 4He films on Vycor glass has been made. We have conclusively established the 3D nature of the critical region by the observation of a heat capacity peak coincident with Z', of the film. In addition, we find reasonable agr