Thesis (Ph.D.), - University of Manchester, Department of Physics and Astronomy.
|Contributions||University of Manchester. Department of Physics and Astronomy.|
|The Physical Object|
|Number of Pages||181|
The Manchester rotating cryostat has been used to measure the longitudinal and transverse coefficients of vortex mutual friction in the A and B phases of superfluid :// The laminar flow displays no excess dissipation beyond mutual friction, which vanishes in the T→0 limit, in contrast with turbulent vortex motion where dissipation has been earlier measured to Andreev reflection of quasiparticle excitations provides a sensitive and passive probe of flow in superfluid 3He-B. It is particularly useful for studying complex flows generated by vortex rings This demonstration in 3 He-B shows that in addition to the applied flow velocity also mutual friction matters importantly in the formation of new vortices, in their expansion, and in the onset of turbulence. In 3He- B, mutual friction dissipation α(T) is strongly temperature-dependent (Figure 1), and it so happens that α(T) drops to sufficiently low value for the onset of turbulence in the
Gyroscopic measurements have demonstrated persistent currents in both superfluid phases of 3 He. In addition, experimental data on vortex-free counterflow states, on critical velocities, on vortex states of 3 He-A in restricted geometries and on mutual friction between the vortex lattice and the normal fluid are :// Film Flow Driven by van der Waals Forces. Pages AC Measurements of a Coupling Between Dissipative Heat Flux and Mutual Friction Force in He II. Pages Vidal, Félix (et al.) Brillouin Scattering from Superfluid 3He-4He Mixtures. Pages Benjamin, R. F. (et al.) › Physics › Condensed Matter Physics. [In Book] Vortex formation and dynamics in superfluid 3He and analogies in quantum field theory, Progress in Low Temperature Physics (). [DOI] Konstandin, A., Kopu, J., and Eschrig, M., "Superconducting proximity effect through a magnetic domain The study of liquid helium has been underway since 1 , when helium was first liquefied. The superfluidity of helium II has been known since 1 , and has been intensively studied ever since. Surprisingly, there is still no fundamental microscopic theory widely accepted for superfluid 4He, although there is for superfluid 3He. Nevertheless, the phenomenological theory of superfluid helium
Upgrade of the CERN cryogenic station for superfluid helium testing of prototype LHC superconducting magnets Theoretical and experimental investigations on effects of charge pressure on performance of linear motor driven miniature cryocooler. Patel, L. N (NbTi)~3Sn wire on friction and electric contact resistance. Iwahuchi, A :CN This condition is not the problem for some phases of superfluid 3He (the superfluid 3He-B and the polar phase). In both phases there is a large barrier for the creation of mass vortices. In experiments, the mass vortices are created under rotation if either the large critical velocity is exceeded, or if the liquid is cooled down from the normal In superfluid 3He, for example, the atoms can be attracted to each other by molecular forces, whereas they are repelled from each other at short distance due to a hardcore repulsion. The attraction gives rise to Cooper pairs, and the repulsion is overcome by paramagnon Web view. This book describes the theory of such quantum numbers, starting with Dirac's argument for the quantization of electric charge, and continuing with discussions on the helium superfluids, flux quantization and the Josephson effect in superconductors, the quantum Hall effect, solids and liquid crystals, and topological phase ://