Tunneling into Current-Carrying Surface States of High T$_c$ Superconductors

Details Tunneling into Current-Carrying Surface States of High T$_c$ Superconductors Tunneling into Current-Carrying Surface States of High T$_c$ Superconductors

1997-05-26

arxiv.org/abs/cond-mat/9705260v1

Phys. Rev. Lett. 79, 281 (1997)

Physics

Condensed Matter

Superconductivity

4 pages in a RevTex (3.0) file plus 3 Figures in PostScript. To appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.79.281

Theoretical results for the ab-plane tunneling conductance in the d-wave model for high Tc superconductors are presented. The d-wave model predicts surface bound states below the maximum gap. A sub-dominant order parameter, stabilized by the surface, leads to a splitting of the zero-bias conductance peak (ZBCP) in zero external field and to spontaneous surface currents. In a magnetic field screening currents shift the quasiparticle bound state spectrum and lead to a voltage splitting of the ZBCP that is linear in H at low fields, and saturates at a pairbreaking critical field of order 3 Tesla. Comparisons with recent experimental results on Cu/YBCO junctions are presented.

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