title: Coherent low-energy charge transport in a diffusive S-N-S junction.
abstract: We have studied the current-voltage characteristics of diffusive mesoscopic Nb-Cu-Nb Josephson junctions with highly transparent Nb-Cu interfaces. We consider the low-voltage and high-temperature regime eV < epsilon(c) < k(B)T, where epsilon(c) is the Thouless energy. The observed excess current as well as the observed subharmonic Shapiro steps under microwave irradiation suggest the occurrence of low-energy coherent multiple Andreev reflection.
authors.affiliation: Centre de Recherches sur les Très Basses Températures, C.N.R.S., associé à l'Université Joseph Fourier, 25 Av. des Martyrs, 38042 Grenoble, France.
authors.forename: P
authors.initials: P
authors.lastname: Dubos
authors.forename: H
authors.initials: H
authors.lastname: Courtois
authors.forename: O
authors.initials: O
authors.lastname: Buisson
authors.forename: B
authors.initials: B
authors.lastname: Pannetier