Jun'ichiro Hara

Theory of the Andreev reflection and the density of states in proximity contact normal-superconducting infinite double-layer

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 Greens function which already satisfy the boundary condition and include no exploding terms at infinities. The self-consistent pair potentials are obtained numerically with sufficient accuracy. The Andreev reflection at the N-S interface is discussed on the basis of the self-consistent pair potential. It is shown that there exists a resonance state in a potential valley formed between the depressed pair potential and the partially reflecting interface, which leads to a peak of the Andreev reflection coefficient with the height unity slightly below the bulk superconductor energy gap. We also find general relationship between the Andreev reflection coefficient and the local density of states of the superconductor just at the interface.

Shear viscosity of the B phase of superfluid3He

AbstractThe shear viscosity η(T) in the Balian-Werthamer (BW) state of superfluid3He is calculated variationally throughout the region 0≤t≤ 1(t=T/Tc) from the transport equation for Bogoliubov quasiparticles. Coherence factors are treated exactly in the calculation of the collision integral. The numerical result for

Boundary conditions for quasiclassical Green's function for superfluid Fermi systems

\tilde \eta

Microscopic derivation of the hydrodynamic equations for the superfluid Fermi system: Application to the two-fluid hydrodynamic equations in superfluid 3He-B

=ηs= ηs(T)/ηn(Tc) agree very well with experiment in the range 0.8≤t≤1.0. Analytic expressions

Rough Surface Effect on Diamagnetic Response of Normal-Superconducting Proximity Contact System with Arbitrary Concentration of Impurities

\tilde \eta

Possible range of values for the reduced shear viscosity of superfluid 3HeB

= 0.577 (1−1.0008t) and