1 - 9 of 9 articles
We re-examine the calculations of the transport entropy of vortices and find that the old definitions of the heat current available in the literature are unsatisfactory. Based on the microscopic theory of nonstationary superconductivity, we obtain the prescription how to calculate the heat...
In an inelastic neutron scattering (INS) experiment on3He-4He mixtures one observes, besides the photon-roton mode which is barely modified by the admixture of3He, an additional excitation at lower energies which is interpreted as quasi-particle-hole excitations of a nearly free Fermi gas. We...
The superconducting phase diagram ofUPt
3, as determined by accurate dilatometry as function of temperature and magnetic field (B‖c andB⊥c), exhibits three superconducting phases which meet in a tetracritical point. We show that the measured phase diagrams are thermodynamically stable and that...
The first Ginzburg-Landau equation for the order parameter ψ in the absence of magnetic fields is solved analytically for a superconducting slab of thickness 2d bordered by semi-infinite regions of normal metal at each face. The real-valued normalized wave function f=ψ/ψ∞ depends only on the...
Proximity contact N-S double-layer with infinite layer widths is studied in the clean limit. The finite reflection at the interface is taken into account. Starting from a recent theory of finite width double-layer by Ashida et al., we obtain explicit expressions for the quasi-classical Green's...
A charged magnetic microsphere (radius 100 µm) is levitating inside a superconducting niobium capacitor. Because of its charge of about 1 pC, oscillations about the equilibrium position can be excited and detected electrically. The properties of this oscillator are investigated in order to study...
The results of an experimental investigation of the evolution of planar, non-linear, second-sound pulses in superfluid4He, to within 650 nK of the λ-transition, are presented. A new method for extracting the second-sound velocity and damping is demonstrated. As predicted from two-fluid...
We have measured the thermal conductivity of high quality low density hcp4He Crystals. The behavior is well described by standard phonon thermal conductivity theory. We discuss the limits that these measurements set on the thermal conductivity due to vacancies.
We report electron heating measurements below the resistance maximum associated with the spin-glass freezing transition. The differential resistance showed features under the application of a dc electric field which cannot be readily interpreted in a simple electron heating picture. We...
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