Cancellation of quasiparticle mass enhancement in the conductance of point contacts

G. Deutscher, P. Nozières

Research output: Contribution to journalArticlepeer-review


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 languageEnglish
Pages (from-to)13557-13562
Number of pages6
JournalPhysical Review B-Condensed Matter
Issue number18
StatePublished - 1994
Externally publishedYes


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