Fivefold splitting of the squashing collective mode of superfluid sup 3 He- B by a magnetic field
- 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), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 44:1; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COLLECTIVE EXCITATIONS
ELECTRONIC CIRCUITS
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
EXCITATION
HELIUM 3
HELIUM 3 B
HELIUM ISOTOPES
ISOTOPES
LANDE FACTOR
LIGHT NUCLEI
MAGNETIC FIELDS
NUCLEI
PRESSURE DEPENDENCE
PULSE CIRCUITS
PULSE SHAPERS
SIGNAL CONDITIONERS
SOUND WAVES
STABLE ISOTOPES
TIME-OF-FLIGHT METHOD
VERY LOW TEMPERATURE
ZEEMAN EFFECT