Europhys. Lett, 46 (1), pp. 118-119 (1999)
Europhys. Lett, 42 (5), pp. 553-558 (1998)
Surface superconductivity in a wedge
V. M. Fomin 1, J. T. Devreese 1 and V. V. Moshchalkov 2
1 Theoretische Fysica van de Vaste Stof,
Universiteit Antwerpen (UIA)
Universiteitsplein 1, B-2610 Antwerpen, Belgium
2 Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven Celestijnenlaan 200 D, B-3001 Leuven, Belgium
PACS. 74.80-g - Spatially inhomogeneous structures.
PACS. 74.20De - Phenomenological theories (two-fluid, Ginzburg-Landau, etc.).
PACS. 74.25Dw - Superconductivity phase diagrams.
Two coefficients are wrong in eq. (16); the correct last term in the first square brackets and the last term in the curly brackets are, respectively,
The extrema shown in fig. 2 turn out to be spurious; the correct fig. 2 is as shown below.
With the variational approach, the optimal is provided by the trial function (18) with n=0 for the smaller angles and with n=1 for the larger angles .The "kink'' at results from the choice of our variational trial functions. At larger angles, there exists a surface-enhanced superconducting state with the current along the whole boundary, penetrating the nearest vicinity of the edge. At smaller angles, we find that a confined circulating superconducting current appears in the vicinity of the edge, sustaining higher magnetic fields than the nucleation field at the plane superconductor surface. For , with our trial function with n=0, the nucleation field behaves asymptotically as .
We thank F. M. PEETERS and V. A. SCHWEIGERT for bringing to our attention, prior to publication, the fact that there is a discrepancy between some of their recent results and some of our variational results given in Europhys. Lett., 42 (5), pp. 553-558 (1998). We thank F. BROSENS for valuable discussions concerning the analytical structure of the theory.
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