2001/03/28 by Amos Sharoni, A. Sharoni, G. Koren +2 · 3 citations
Engineering · Physics and Astronomy · #Acoustic Wave Resonator Technologies #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #cond-mat.supr-con
paper · pdf · doi:10.1209/epl/i2001-00368-1
published as Europhys. Lett., 54 (5), pp. 675-681 (2001) · accepted to epl
arxiv created 2001/03/28 · openalex publication_date 2001/06/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
Tunneling spectra measured on thin epitaxial YBa 2 Cu 3 O 7 − δ 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.