Enhancement of penetration field in vortex matter in mesoscopic superconductors due to Andreev bound states

M. I. Dolz; N. R. Cejas Bolecek; J. Puig; H. Pastoriza; G. Nieva; J. Guimpel; C. J. van der Beek; M. Konczykowski; Y. Fasano

doi:10.1103/PhysRevB.100.064508

Enhancement of penetration field in vortex matter in mesoscopic superconductors due to Andreev bound states

M. I. Dolz, N. R. Cejas Bolecek, J. Puig, H. Pastoriza, G. Nieva, J. Guimpel, C. J. van der Beek, M. Konczykowski, Y. Fasano

DOI 10.1103/PhysRevB.100.064508 · Physical Review B

T1

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Abstract

We study the field for the penetration of a first vortex, HP, for vortex matter nucleated in micron-sized samples with edges aligned along the nodal and antinodal directions of the d-wave superconducting order parameter of Bi2Sr2CaCu2O8−δ. Here we present evidence that the HP for vortex matter nucleated in mesoscopic samples with edges parallel to the nodal direction is larger than for the antinodal case, ∼72% at low temperatures. This finding supports the theoretical proposal that surface Andreev bound states appearing in a sample with edges parallel to the nodal direction would produce an anomalous Meissner current that increases the Bean-Livingston barrier for vortex penetration.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown