Broken particle-hole symmetry at atomically flat a-axis YBa 2Cu3O7-δ interfaces

Bruce A. Davidson, Revaz Ramazashvili, Simon Kos, James N. Eckstein

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article number107004
Pages (from-to)107004-1-107004-4
JournalPhysical review letters
Issue number10
StatePublished - Sep 3 2004

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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