Leggett's plasma resonances and two-gap structures in the CVCs of MgB${}_2$ break junctions $-$ a direct evidence for a two-gap superconductivity in MgB${}_2$

Ya. G. Ponomarev, S. A. Kuzmichev, M. G. Mikheev +13

In the present investigation (2002) the current-voltage characteristics (CVCs) of break junctions in polycrystalline $Mg{B}_2$ samples have been studied in the temperature range $4.2…