NMR studies on vortices in rotating /sup 3/He-A

Journal Article · Thu Aug 01 04:00:00 EDT 1985 · J. Low Temp. Phys.; (United States)

DOI:https://doi.org/10.1007/BF00681639· OSTI ID:5186967

Hakonen, P J; Krusius, M; Seppaelae, H K

NMR measurements are reported on rotating /sup 3/He-A in a long cylindrical geometry of 5 mm diameter at a liquid pressure of 29.3 bar and in axial magnetic fields of 14.2, 28.4, and 56.9 mT. At 28.4 mT, NMR studies are also reported in fields inclined by 25/sup 0/ and 90/sup 0/ from the axis of rotation. The frequency shift, the width, and the intensity of the spin wavemodes localized on the soft vortex cores, as well as the additional broadening of the main NMR line during rotation, were measured as a function of temperature, angular velocity ..cap omega.., magnetic field intensity, and its inclination angle. Also observed were a critical angular velocity of vortex formation, hysteretic behavior in the number of vortices when comparing accelerating rotation to decelerating, and metastable vortex densities, presumably a vortex tangle after rapid oscillatory acceleration. The results can be understood in terms of the continuous 4..pi.. vortices first proposed by Seppaelae and Volovik.

• Research Organization: Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland
• OSTI ID: 5186967
• Journal Information: J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 60:3; 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
HELIUM 3
HELIUM 3 A
HELIUM ISOTOPES
HYSTERESIS
ISOTOPES
LIGHT NUCLEI
LINE BROADENING
MAGNETIC RESONANCE
MEDIUM PRESSURE
MEDIUM VACUUM
MOTION
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ORDER PARAMETERS
RESONANCE
ROTATION
SPIN WAVES
STABLE ISOTOPES
VORTICES