Effects of 4He coating on the size effects in superfluid 3He as measured by fourth sound

✍ Scribed by Donglak Kim; Takashi Miki; Osamu Ishikawa; Tohru Hata; Takao Kodama; Haruo Kojima

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 201 KB
• Volume: 165-166
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/s0921-4526(90)81168-n

✦ Synopsis

We studied t e effects of 4He coating of the surfaces of alumina powder grains on the superfluid fraction of 3 He. The superfluid fraction was measured by fourth sound techniquea. The observed size effects in pure 3He were similar to our previous results. When 1 layer of He coverage was adsorbed onto the powder, no change in the superfluid fr ction was observed.

! The attenuation of fourth sound was not affected either. When 3 layers of He coverage was adsorbed, a substantial increase in the superfluid fraction was observed. An increase in the attenuation of fourth sound was also seen.