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Tunneling into Current-Carrying Surface States of High T_c Superconductors

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arxiv cond-mat/9705260 v1 pith:S3KM66PF submitted 1997-05-26 cond-mat.supr-con

Tunneling into Current-Carrying Surface States of High T_c Superconductors

M. Fogelstr\"om (Northwestern University) , D. Rainer (Universit\"at Bayreuth) , J. A. Sauls (Northwestern University) This is my paper
classification cond-mat.supr-con
keywords surfacefieldboundconductancecurrentsd-wavehighmodel
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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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