Two-phonon absorption by the real squashing mode in superfluid sup 3 He- B

Journal Article · Mon Jun 17 00:00:00 EDT 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.3152· OSTI ID:5539196

Torizuka, K; Pekola, J P; Manninen, A J; Kyynaeraeinen, J M ^[1]; McKenzie, R H ^[2]

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1. Low Temperature Laboratory, Helsinki University of Technology, 02150 Espoo, Finland (FI)
2. Department of Physics, Ohio State University, Columbus, Ohio 43210 (USA)

We have observed in superfluid {sup 3}He-{ital B} two-phonon absorption, which is one of the nonlinear effects recently predicted by McKenzie and Sauls. The {ital J}=2{sup +} real squashing mode was excited with two coincident sound pulses at the temperature {ital T}{sup +}, f{sub signal}+{ital f}{sub pump}={ital f}{sub rsq}({ital T}{sup +}), under 0, 2.7, and 3.5 bars pressure. The heights of the attenuation peaks scale almost linearly with the energy of the higher-intensity wave, in qualitative agreement with the theory. Furthermore, a satellite peak appears even in zero magnetic field, which originates from the reflected wave.

• OSTI ID: 5539196
• Journal Information: Physical Review Letters; (USA), Vol. 66:24; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HELIUM 3 B
PHONONS
ATTENUATION
NONLINEAR PROBLEMS
PHASE VELOCITY
ULTRASONIC WAVES
EVEN-ODD NUCLEI
HELIUM 3
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
QUASI PARTICLES
SOUND WAVES
STABLE ISOTOPES
VELOCITY
640450* - Fluid Physics- Superfluidity