Physics – Condensed Matter – Superconductivity
Scientific paper
1999-10-26
J. Appl. Phys. 87, 5549 (2000).
Physics
Condensed Matter
Superconductivity
4 pages with 1 embedded ps figure. Manuscript submitted to the MMM'99 conference
Scientific paper
10.1063/1.373400
We discuss the effects of a magnetic field applied parallel to the Cu-O ($ab$) plane of the high $T_c$ cuprate superconductors. After briefly reviewing the Zeeman effect of the field, we study the orbital effects, using the Lawrence-Doniach model for layered superconductors as a guide to the physics. We argue that the orbital effect is qualitatively different for in-plane and inter-layer mechanisms for superconductivity. In the case of in-plane mechanisms, interlayer couplings may be modeled as a weak interlayer Josephson coupling, whose effects disappear as $H\to\infty$; in this case Zeeman dominates the effect of the field. In contrast, in the inter-layer mechanism the Josephson coupling {\em is} the driving force of superconductivity, and we argue that the in-plane field suppresses superconductivity and provides an upper bound for $H_{c2}$ which we estimate very crudely.
Sondhi Shivaji L.
Yang Kun
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