Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
1996-12-17
Phys.Rev.B, Vol.59, No.10 (1999), 7064-7075
Physics
Condensed Matter
Soft Condensed Matter
20 pages, LaTeX, no figures
Scientific paper
Two new general representations (the series and the integral) for the mass current $\vj$ in weakly inhomogeneous superfluid A-phase of Helium--3 are obtained near zero of temperature by solving the Dyson-Gorkov equation. These representations result in additional correcting contribution to the standard leading expression for $\vj$ which is of first order in gradients of the orbital angular momentum vector $\hl$. The total supplementary term is found as integral, and, provided the London limit holds, the procedure is advanced to expand it at T=0 asymptotically by the Laplace method in powers of gradients of $\hl$. Three special static orientations of $\hl$ with respect to its curl are considered to calculate the higher correcting terms up to third order. Coefficients at the quadratic terms are estimated numerically, new cubic contributions are found which contain the logarithm of the London parameter.
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