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Showing 1 to 20 of 159 for “"Superfluid"”.
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Superfluid helium on solid hydrogen
We measure the third sound velocity of superfluid helium films as functions of temperature and film coverage on H$\sb2,$ D$\sb2,$ and Ar substrates. A new phase of superfluid is discovered on the weak-binding H$\sb2$ substrate. We observe, in addition to third sound, a new surface mode of wave …
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Diffusion of He3 in superfluid background.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1971. Ph.D.
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On the hydrodynamics of superfluid helium
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1963.
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Superfluid neutron star dynamics, mutual friction and turbulence
This thesis investigates the role of superfluidity in neutron stars and associated phenomena. We model the internal fluid of a neutron star as a two-component system: one of charged particles and one of superfluid neutrons. We derive a set of multi-constituent hydrodynamic equations that allows for …
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Superfluid Density Measurements of High-Temperature Superconducting Films
… inductive system suitable for measuring the superfluid density of superconducting films. With this system we measure several intrinsic properties of YBa2Cu3O7-x (YBCO) and Bi2Sr2CaCu2O8+δ (Bi-2212) films. Two competing models of the pseudogap are compared to the temperature dependence of the …
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Measurements of vortex diffusivity in 2D superfluid 4He
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-02T16:33:20Z No. of bitstreams: 1 1987_Volz.pdf: 1786717 bytes, checksum: 1cc26e52df659ca7f06b9deb99151dd8 (MD5)
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Towards A Single Electron Current On Superfluid Helium
… of electrons floating above the surface of superfluid helium to the field of single electron transport. Previous work done by Dr Forrest Bradbury at Princeton University (now a collaborator in the group) demonstrated the highly efficient and precise control of packets of electrons floating …
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Studies of superfluid stirling and pulse tube refrigeration
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Imaging the shapes and dynamics of superfluid helium nanodroplets
… imaging of biomolecules, the thesis investigates superfluid helium nanodroplets in an experiment at the FERMI FEL that is focused on the interaction of intense light pulses with matter by analyzing wide-angle scattering patterns. The experiment can be divided in two parts: In the first part, the …
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Visualization of the Vortex Lattice Dynamics in Superfluid Helium
… and dynamics of the quantized vortices in superfluid helium-4 using a new rotating experiment. This setup includes control of the entire apparatus from the rotating frame, installation of a new EMCCD camera that allows for imaging of nanoscale tracer particles, and the development and …
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Quasiparticle beam profile measurements in superfluid helium 3 - B
… details experiments in the ballistic regime of superfluid 3He-B at temperatures around 100 ➭K. In this thesis, the quasiparticle beam profile from a Black-Body radiator and a vibrating wire resonator is measured using a quasiparticle camera which consists of 25 tuning forks. The vibrating wire …
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Measurements of Vortex Diffusivity in 2d Superfluid Helium-4
… first time the characteristics of vortex induced superfluid flow dissipation at temperatures well below the Kosterlitz-Thouless superfluid transition temperature. Our studies are with films of coverage .25 < (sigma)(,s) < 1.9 superfluid atomic layers and with .55 < T(,KT) < 1.9(DEGREES)K. We use a …
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Theory of the Mobility of Ions in Superfluid Helium
Made available in DSpace on 2015-05-12T22:38:49Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7309875.PDF: 5300457 bytes, checksum: 05e3571d9e8a4a93d1866aebc134203d (MD5) Previous issue date: 1972
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Theory of the Mobility of Ions in Superfluid Helium
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2011-07-07T19:33:34Z No. of bitstreams: 1 1972_perez.pdf: 5610296 bytes, checksum: fb0c466c8ea1adcb0fe195b7ea3fa303 (MD5)
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Taking Steps Towards Superfluid-like Spin Transport in Metallic Ferromagnets
… form of magnetization dynamics, referred to as superfluid-like spin transport, as a way to overcome this shortfall. Instead of decaying exponentially with distance, the spin current associated with superfluid-like spin transport decays linearly with distance, potentially allowing for information …
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Phonon-quasiparticle interactions in dilute solutions of He3 in superfluid He4
… interactions in dilute solutions of He3 in superfluid He4 and the role they play in determining the linear response prQperties of such solutions are examined. The vertices for phonon scattering and absorption by He3 quasiparticles as well as the effective interaction between quasiparticles …
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B phase nucleation and A-B interface dynamics in superfluid 3He
… nucleation and subsequent expansion of the superfluid 3He-B phase in the metastable, hypercooled A phase. An overview of the theory of dynamical phenomena in Fermi superfluids is presented in Chapter 1 with an eye towards formulating a theory suitable for studying the dynamics of the first …
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Landau model for films and interfaces of superfluid 4HE at T=OK
… a Landau theory appropriate to an inhomogeneous superfluid at temperature T = 0 to describe structural and dynamical effects at a gas/superfluid interface and for a superfluid film on an inert attractive substrate. The parameters of the theory are determined phenomenologically by fitting measured …
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B phase nucleation and A-B interface dynamics in superfluid helium-3
… nucleation and subsequent expansion of the superfluid $\sp3$He-B phase in the metastable, hypercooled A phase. An overview of the theory of dynamical phenomena in Fermi superfluids is presented in Chapter 1 with an eye towards formulating a theory suitable for studying the dynamics of the …
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Quantized vortices in arbitrary dimensions and the normal-to-superfluid phase transition
… are explored in the general setting of a superfluid in arbitrary dimensions. The vortices may be idealized as objects of co-dimension two, such as one-dimensional loops and two-dimensional closed surfaces, respectively, in the cases of three- and four-dimensional superfluidity. By using …
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