@article{f1defba8baf94bf3b07597df545785a3,
title = "Broken particle-hole symmetry at atomically flat a-axis YBa 2Cu3O7-δ interfaces",
abstract = "A particle hole asymmetric conductance spectra tunneling into an atomically flat (100) YBCO surface was investigated through a nonmagnetic insulator. The tunnel junctions were fabricated from metal-insulator-superconductor (NIS) trilayer films by ozone assisted molecular beam epitaxy. The in situ reflection high-energy electron diffraction (RHEED) was used to characterize the surface crystal structure and morphology during film and heteroepitaxial barrier growth. A subgap asymmetry of the quasiparticle density of states in the superconducting state was observed as a consequence of the termination of the cuprate crystal at the boundary.",
author = "Davidson, {Bruce A.} and Revaz Ramazashvili and Simon Kos and Eckstein, {James N.}",
note = "Funding Information: We thank K. E. Gray, D. K. Morr, M. R. Norman, M. V. Klein, P. J. Hirschfeld, and I Vekhter for discussions, and E. Colla for technical assistance. B. A. D. and R. R. thank the Condensed Matter Theory group, Abdus Salam ICTP (Trieste) for kind hospitality. B. A. D. and J. N. E. were supported by U.S. ONR Grant No. N00014-00-1-0840; R. R. by U.S. DOE, Basic Energy Sci.–Mat. Sci., Contract No. W-31-109-ENG-38 and the MacArthur Foundation at UIUC; S. K. by Contract No. NSF-DMR-98-1794 while at UIUC and LANL DR Project No. 200153 and U.S. DOE Contract No. W-7405-ENG-36 while at LANL. We thank the F. Seitz MRL-CMM and MRL-Microfab lab (UIUC), U.S. DOE, Mat. Sci. No. DEFG02-91ER45439.",
year = "2004",
month = sep,
day = "3",
doi = "10.1103/PhysRevLett.93.107004",
language = "English (US)",
volume = "93",
pages = "107004--1--107004--4",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "10",
}