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

DOLZ, M. I.; BOLECEK, N. R. CEJAS; PUIG, J; PASTORIZA, H.; G. NIEVA; GUIMPEL, J; VAN DER BEEK, C. J.; KONCZYKOWSKI, M.; FASANO, Y.

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

American Physical Society

Año: 2019 vol. 100

0163-1829

We study the field for the penetration of a first vortex, H P , 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 H P 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.