Pulsed NMR and zero sound measurements in superfluid helium-three

Thesis/Dissertation · Mon Jan 01 04:00:00 EST 1979

OSTI ID:5978135

Giannetta, R W

Pulsed nuclear magnetic resonance experiments have been performed in the A and B phases of superfluid /sup 3/He, at pressures of 23 and 27 Bar. Measurements of /sup 3/He-B spin susceptibility, /sup 3/He-A depole frequency, and nonlinear frequency shifts in both phases all agree well with previous measurements by other workers. Additional, unexplained spin motions in /sup 3/He-B were also observed. Spin relaxation studies are consistent with those of Corrucini and Osheroff and Webb in /sup 3/He-A, but differ considerably in /sup 3/He-B. Using large angle RF pulses, anomalous frequency shifts were observed, whose persistence indicated new, metastable resonances in /sup 3/He-A. The measurements are in excellent agreement with those of Bozler et al. The soliton lattice model of Bruinsma and Maki is discussed and compared with the experimental results. In most respects, the model accurately fits the data. Preliminary results of zero sound measurements in /sup 3/He-B are also discussed. At low pressures, evidence is presented for a separation of pair-breaking and collective mode contributions to 10MHz zero sound attenuation. Moreover, the oscillations in attenuation with temperature, first observed by Paulson and Wheatley were observed. Finally, measurements of sound attenuation and velocity at 50 MHz revealed unexpected structure as a function of temperature.

• Research Organization: Cornell Univ., Ithaca, NY (USA)
• OSTI ID: 5978135
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR MOMENTUM
ATTENUATION
ELECTRICAL PROPERTIES
EVEN-ODD NUCLEI
HELIUM 3
HELIUM 3 A
HELIUM 3 B
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
NUCLEI
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
PULSE TECHNIQUES
QUASI PARTICLES
RESONANCE
SOLITONS
SPIN
STABLE ISOTOPES
ULTRALOW TEMPERATURE
ZERO SOUND