Observation of quantum limit of zero sound absorption in normal3He at 400 MHz

✍ Scribed by Koichi Matsumoto; Toru Ikegami; Yuichi Okuda

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 174 KB
• Volume: 194-196
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)90701-3

✦ Synopsis

We are studying the quantum limit of zero sound absorption in normal 3He in which sound quanta are absorbed or emitted directly by quasiparticles. For that experiment, high frequency ultrasound is required since the condition hto > K T must be satisfied. We have succeeded in observing zero sound at the frequency of 400 MHz which is high enough to confirm the quantum effect. In the preliminary experiment, the absorption decreases with the square of temperature as is predicted by Fermi liquid theory and is seen to remain finite at absolute zero temperature.