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Updated: Jul 23, 2026

Atom Probe Tomography Studies on the Cu(In,Ga)Se2 Grain Boundaries
Published on: April 22, 2013
Broken particle-hole symmetry at atomically flat a-axis YBa2Cu3O7-delta interfaces
Bruce A Davidson1, Revaz Ramazashvili, Simon Kos
1Physics Department, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA. davidson@tasc.infm.it
Abstract:
We have studied quasiparticle tunneling into atomically flat a-axis films of YBa(2)Cu(3)O(7-delta) and DyBa(2)Cu(3)O(7-delta) through epitaxial CaTiO3 barriers. The junction heterostructures were grown by oxide molecular beam epitaxy and were carefully optimized using in situ monitoring techniques, resulting in unprecedented crystalline perfection of the superconductor-insulator interface. Below T(c), the tunneling conductance shows the evolution of a large unexpected asymmetrical feature near zero-bias. This is evidence that superconducting YBCO crystals, atomically truncated along the lobe direction with a titanate layer, have intrinsically broken particle-hole symmetry over macroscopically large areas.
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