Correlation of tunneling spectra with surface nano-morphology and doping in thin YBa2Cu3O7-delta films

Details Correlation of tunneling spectra with surface nano-morphology and doping in thin YBa2Cu3O7-delta films Correlation of tunneling spectra with surface nano-morphology and doping in thin YBa2Cu3O7-delta films

2001-03-28

arxiv.org/abs/cond-mat/0103581v1

Europhys. Lett., 54 (5), pp. 675-681 (2001)

Physics

Condensed Matter

Superconductivity

accepted to epl

Scientific paper

10.1209/epl/i2001-00368-1

Tunneling spectra measured on thin epitaxial YBa2Cu3O7-delta films are found to exhibit strong spatial variations, showing U and V-shaped gaps as well as zero bias conductance peaks typical of a d-wave superconductor. A full correspondence is found between the tunneling spectra and the surface morphology down to a level of a unit-cell step. Splitting of the zero bias conductance peak is seen in optimally-doped and overdoped films, but not in the underdoped ones, suggesting that there is no transition to a state of broken time reversal symmetry in the underdoped regime

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