2003/11/19 by L. Shkedy, Lior Shkedy, P. Aronov +2
Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.69.132507
5 figures
arxiv created 2003/11/19 · openalex publication_date 2004/04/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Dynamic resistance spectra of ramp type junctions made of underdoped YBa2Cu3Oy (YBCO) electrodes and Ga-doped YBCO barrier are reported. Series of equidistant peaks were observed in these spectra in junctions oriented along the node direction. Junctions with different barrier thickness dN showed that the distance between adjacent peaks scales inversely with dN. The peaks were thus identified as due to McMillan-Rowell like oscillations in the barrier. Analysis of the series of peaks yields an upper limit of about 3.7 meV on the value of the energy gap along the node. We attribute this small gap to the is component of the order parameter of underdoped YBCO near the interface of the junctions.