Critical Behavior of Layered Superconducting Films in Parallel Magnetic Field

Abstract

The equilibrium magnetization for layered superconducting films that experience a nonzero component, $H_{\parallel }$, of magnetic field applied parallel to the layers is computed at temperatures and at perpendicular field components in the vicinity of the decoupling transition. A fermion analogy is exploited for this purpose, whereby it is found that the parallel magnetization shows an anomalous $H_{\parallel }^{-1}$ tail at high fields due to entropic fluctuations of the (parallel) lattice of Josephson vortices. A collective pinning effect is also identified for $c$-axis transport limited by a single planar defect oriented parallel to both $c$ and to the applied magnetic field.

20 pgs PLAIN TeX, 2 postscript figs., expanded into article to appear in Physical Review B, Vol. 58

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