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The stability of a current-carrying normal state in a superconducting channel with nonhomogeneities is considered at T
Pinning of vortices in a type II superconductor by randomly positioned identical point pins is simulated using the two-dimensional method described in a previous paper (Part I). The system is characterized by the vortex and pin numbers (N
), the vortex and pin interaction ranges (R
A new formalism is presented to study the critical and tricritical dynamics of3He-4He mixtures near the superfluid transition for arbitrary concentration. In this fluid two conserved variables, the molar concentrationX and the entropys, are twofold coupled to a complex order parameter ψ first in...
Distinctive structure in the tunneling characteristics of junctions having a superconducting electrode arises at a biasV
0 where junction dissipation is sufficient to drive the electrode normal. While details of this structure are dependent upon junction-bath thermal linkage, in all cases a...
By assuming a phenomenological Ginzburg-Landau-Wilson free energy for3He-4He mixtures near the critical surface of the superfluid transition we can express thermodynamic derivatives of the form (∂a/∂b)
in terms of a correlation function of ¦ψ¦2, where Gy is the order parameter. Herea, b, c,...
The convective instability of a superfluid3He-4He mixture in a porous medium confined between parallel horizontal planes is studied. It is shown that this system behaves as a pure classical liquid in a porous medium from the point of view of the convective instability in the whole range of the...
A microscopic theory of ferromagnetic superconductors is developed from first principles. Self-consistent equations for the superconducting order parameter Δ and spontaneous magnetizations 〈S
〉 are derived using a Green's function technique and considering thef-d exchange effect up to the...
The summation of pinning forces to a volume force exerted on the vortex lattice in type II superconductors allowing it to carry a loss-free current is not fully understood. In order to clarify this question we have started computer simulations of flux pinning. It is shown that for many...
We present a method of temperature measurement based on a liquid3He vapor pressure thermometer with a resolution of one part in 109 of the absolute temperature over the range from 1.6 to 2.2 K. The thermometer, as well as apparatus suitable for the assessment of the resolution and stability of...
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