Fivefold splitting of the squashing collective mode of superfluid sup 3 He- B by a magnetic field

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.44.332· OSTI ID:5543769

Movshovich, R; Varoquaux, E; Kim, N; Lee, D M ^[1]

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1. The Laboratory of Atomic and Solid State Physics and the Materials Science Center, Cornell University, Ithaca, New York 14853 (US)

We have conducted an ultrasonic pulse-time-of-flight investigation of the squashing mode of superfluid {sup 3}He-{ital B} in a magnetic field. All five of the expected Zeeman sublevels for this {ital J}=2{sup {minus}} mode were observed. The investigation was done at a very low temperature ({ital T}/{ital T}{sub {ital c}}{lt}0.35) to reduce the quasiparticle broadening that tends to smear the collective modes and makes resolution of the individual sublevels impossible. Variation of the pressure was used to sweep the collective-mode frequencies through the operating frequency, 137.6 MHz of the resonant-sound transducers. Both group-velocity spectroscopy and pulse-shape analysis were used for identification of different sublevels. Performing experiments at different orientations of the sound propagation with respect to magnetic-field direction (parallel, perpendicular, 55{degree}, and 13{degree}) was the key to observation of all five modes and their identification. The Lande {ital g} factor was obtained from the linear dependence of the {ital J}{sub {ital z}}=+2 sublevel on magnetic field and compared with theory.

• OSTI ID: 5543769
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 44:1; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HELIUM 3 B
COLLECTIVE EXCITATIONS
ZEEMAN EFFECT
LANDE FACTOR
MAGNETIC FIELDS
PRESSURE DEPENDENCE
PULSE SHAPERS
SOUND WAVES
TIME-OF-FLIGHT METHOD
VERY LOW TEMPERATURE
ELECTRONIC CIRCUITS
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
EXCITATION
HELIUM 3
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
PULSE CIRCUITS
SIGNAL CONDITIONERS
STABLE ISOTOPES
640450* - Fluid Physics- Superfluidity