Experimental studies of solitons in superfluid /sup 3/He-A

Journal Article · Thu May 01 04:00:00 EDT 1980 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00115622· OSTI ID:5239172

Gould, C M; Bartolac, T J; Bozler, H M

Magnetic textures have been created and studied in the A phase of superfluid /sup 3/He at several pressures, in magnetic fields from 15 to 20 mT, by intense rf magnetic pulses which invert the magnetization of the fluid. To create this new state we find that the initial large pulse must tip the magnetization by at least 140 /sup 0/. In this state the fluid evolves from a condition where the NMR frequency shift ..omega..-..gamma..H/sub 0/ is smaller than that in the unperturbed superfluid by a factor of 0.54, over a time scale of tens of seconds to a condition where the frequency shift is 0.70 times the unperturbed value. We have studied the fluid's linear response to small-angle sampling pulses as well as the nonlinear response to large-angle pulses. By using two independent NMR coils we have seen this new state move through the fluid; we find that a lower limit on its propagation velocity is around one-half the spin wave velocity. All of our results are generally consistent with the model of solitons in the order parameter proposed by Maki and co-workers.

• Research Organization: Department of Physics, University of southern California, Los Angeles, California
• OSTI ID: 5239172
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 39:3; ISSN JLTPA
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
EVEN-ODD NUCLEI
FOURIER TRANSFORMATION
HELIUM 3
HELIUM 3 A
HELIUM ISOTOPES
INTEGRAL TRANSFORMATIONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MAGNETIZATION
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ORDER PARAMETERS
PULSES
QUASI PARTICLES
RESONANCE
SOLITONS
SPECTRAL SHIFT
STABLE ISOTOPES
TEMPERATURE DEPENDENCE
TRANSFORMATIONS