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Scanning tunneling spectroscopy of a-axis YBa_2Cu_3O_7-delta films:k-selectivity and the shape of the superconductor | | A. Sharoni
; G. Leibovitch
; A. Kohen
; R. Beck
; G. Deutscher
; G. Koren
; O. Millo
; | | Date: |
12 May 2003 | | Journal: | Europhys. Lett., 62 (6), pp. 883--889 (2003) | | Subject: | Superconductivity | cond-mat.supr-con | | Abstract: | 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{ extbf{k}}. Possible origins for this emph{ extbf{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{ extbf{k}}-selectivity and the effect of nanofaceting, respectively. | | Source: | arXiv, cond-mat/0305257 | | Services: | Forum | Review | PDF | Favorites | |
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