Suppressed Superconductivity in Ultrathin Mo2N Films due to Pair-Breaking at the Interface

M. Kuzmiak, M. Kopčík, F. Košuth, V. Vaňo, P. Szabó, V. Latyshev, V. Komanický, P. Samuely*

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

1 Sitaatiot (Scopus)

Abstrakti

A strong disorder characterized by a small product of the Fermi vector kF and the electron mean free l drives superconductors towards insulating state. Such disorder can be introduced by making the films very thin. Here, we present 3-nm Mo2N film with kF*l ~ 2 with a resistive superconducting transition temperature Tc = 2 K heavily suppressed in comparison with the bulk Tc. Superconducting density of states (DOS) with smeared gap-like peaks and in-gap states, so called Dynes DOS, is observed by the low-temperature tunneling spectroscopy despite a sharp resistive transition. By scanning tunneling microscope, the spectral maps are obtained and related to the surface topography. The maps show a spatial variation of the superconducting energy gap on the order of 20% which is not accidental but well correlates with the surface corrugation: protrusions reveal larger gap, smaller spectral smearing, and smaller in-gap states. In agreement with our previous measurements on ultrathin MoC films, we suggest that the film-substrate interface introducing the local pair-breaking is responsible for the observed effects and generally for the suppression of the superconductivity in these ultrathin films.

AlkuperäiskieliEnglanti
Sivut1775-1780
Sivumäärä6
JulkaisuJournal of Superconductivity and Novel Magnetism
Vuosikerta35
Numero7
Varhainen verkossa julkaisun päivämäärä12 maalisk. 2022
DOI - pysyväislinkit
TilaJulkaistu - heinäk. 2022
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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