Phonon contribution and 2-roton raman spectrum of HeII

✍ Scribed by Norio Ogita; Mitsuo Watabe; Masayuki Udagawa; Kohji Ohbayashi

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 198 KB
• Volume: 165-166
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/s0921-4526(90)81101-s

✦ Synopsis

2-roton

Raman spectra of superfluid 4He have been measured at T=0.65K under pressures from svp to P=20kg/cm*. No intrinsic spectral width has been observed at all pressures. Contribution of phonons has been found in the lower energy region of the P-roton peak. Considering it, the experimental spectra were compared with the theory by Iwamoto and Ruvalds-Zawadowski (IRZ model). A good fit of the experimental result to the theory has been observed for the svp spectrum.

However, similar analysis of the spectrum at 20kg/cm* has not given a good fit.