Abstract
The high fraction of Andreev reflections that has been observed in noble-metal point contacts with the high-Tc oxides YBa2Cu3O7 and La2-xSrxCuO4 as well as with the heavy-fermion superconductors UPt3 and URu2Si2 suggests that the boundary condition at the interface involves Fermi velocities without mass-enhancement factors. We show theoretically that this is indeed the case for a self-energy (,k) only weakly dependent on k. A comparison between the velocities derived from point-contact experiments with known values of the fully dressed quasiparticle velocities allows a determination of the mass-enhancement factor.
Original language | English |
---|---|
Pages (from-to) | 13557-13562 |
Number of pages | 6 |
Journal | Physical Review B-Condensed Matter |
Volume | 50 |
Issue number | 18 |
DOIs | |
State | Published - 1994 |
Externally published | Yes |