Scanning tunneling spectroscopy of a-axis YBa_2Cu_3O_7-δ films:k-selectivity and the shape of the superconductor

Details Scanning tunneling spectroscopy of a-axis YBa_2Cu_3O_7-δ films:k-selectivity and the shape of the superconductor Scanning tunneling spectroscopy of a-axis YBa_2Cu_3O_7-δ films:k-selectivity and the shape of the superconductor

2003-05-12

arxiv.org/abs/cond-mat/0305257v1

Europhys. Lett., 62 (6), pp. 883--889 (2003)

Physics

Condensed Matter

Superconductivity

7 epl pages, 4 embeded figures

Scientific paper

10.1209/epl/i2003-00455-9

Tunneling spectroscopy of epitaxial (100) oriented \chem{YBa_2Cu_3O_{7-\delta}} films was performed using an STM at 4.2 K. On atomically smooth areas, tunneling spectra revealing clear U-shaped gaps with relatively low zero bias conductance were measured. These spectra can be well fitted to the tunneling theory into a d-wave superconductor only when introducing a strong dependence of the tunneling probability on the wave-vector \emph{\textbf{k}}. Possible origins for this \emph{\textbf{k}}-selectivity in STM measurements will be discussed. On other areas, V-shaped gaps as well as zero bias conductance peaks are observed, indicating relaxation of \emph{\textbf{k}}-selectivity and the effect of nanofaceting, respectively.

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