Tunneling Spectroscopy on c-axis Y{1-x}Ca{x}Ba2Cu3O{7-delta} Thin Films

J. H. Ngai; W. A. Atkinson; J. Y. T. Wei

doi:10.1103/PhysRevLett.98.177003

Tunneling Spectroscopy on c-axis Y{1-x}Ca{x}Ba2Cu3O{7-delta} Thin Films

Superconductivity 2009-11-13 v3

Authors: J. H. Ngai , W. A. Atkinson , J. Y. T. Wei

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Abstract

Scanning tunneling spectroscopy was performed on c-axis Y{1-x}Ca{x}Ba2Cu3O{7-delta} thin films for x= 0, 0.05, 0.15 and 0.20 at 4.2K. The measured spectra show main-gap, sub-gap and satellite features which scale similarly in energy versus Ca-doping, suggesting that they are associated with a single pairing energy. The data is analyzed with a multiband tunneling model which attributes the sub-gap features to the chain band and the satellite and main-gap features to the plane band for d+s pairing symmetry. These results suggest that the superconductivity in Y{1-x}Ca{x}Ba2Cu3O{7-delta} involves multiple bands.

Keywords

tunneling spectroscopy YBa2Cu3O7 multiband superconductivity scanning tunneling microscopy pairing symmetry

Cite

@article{arxiv.cond-mat/0703423,
  title  = {Tunneling Spectroscopy on c-axis Y{1-x}Ca{x}Ba2Cu3O{7-delta} Thin Films},
  author = {J. H. Ngai and W. A. Atkinson and J. Y. T. Wei},
  journal= {arXiv preprint arXiv:cond-mat/0703423},
  year   = {2009}
}

Comments

4 pages, 5 figures, to appear in Physical Review Letters

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