Enhancement of the field of first flux penetration due to Andreev bound states in Bi_2Sr_2CaCu_2O_8+delta

Cornelis van Der Beek (1) , Anna Elisabeth Böhmer (1) , Marcin Konczykowski (1)

1 LSI - Laboratoire des Solides Irradiés - Irradiated Solids Laboratory

First flux penetration into single crystalline Bi_2Sr_2CaCu_2O_8+delta is investigated using magneto-optical imaging and Hall probe array magnetometry. Below 50 K, a slight enhancement of the field of first flux penetration, H_p, is found when the edge normals are oriented at 45° with respect to the principal (ab) crystal axes, rather than parallel to them. We discuss this effect in terms of a role of Andreev bound states [C. Iniotakis, T. Dahm, and N. Schopohl, Phys. Rev. Lett. 100, 037002 (2008).]

Mots clés: Surface Sheath; Vortex Lattices; First Flux Penetration; Surface Barrier; Andreev Bound States; d-wave Superconductivity

Domaines: Supraconductivité [cond-mat.supr-con]

Cornelis van Der Beek, Anna Elisabeth Böhmer, Marcin Konczykowski. Enhancement of the field of first flux penetration due to Andreev bound states in Bi_2Sr_2CaCu_2O_8+delta. 2009. ⟨hal-00444574⟩