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\(_2\)

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\(_2\)

In the present investigation (2002) the current-voltage characteristics (CVCs) of break junctions in polycrystalline \(MgB_2\) samples have been studied in the temperature range \(4.2 K < T < T_c\). An inelastic Cooper pair tunneling accompanied by the emission of Leggett plasmons has been fou...

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Veröffentlicht in:arXiv.org 2023-01
Hauptverfasser: Ponomarev, Ya G, Kuzmichev, S A, Mikheev, M G, Sudakova, M V, Tchesnokov, S N, Timergaleev, N Z, Yarigin, A V, Hein, M A, Mueller, G, Piel, H, Bulychev, B M, Burdina, K P, Gentchel, V K, Sevastyanova, L G, Krasnosvobodtsev, S I, Varlashkin, A V
Format: Artikel
Sprache:eng
Schlagworte:
Cooper pairs
Current voltage characteristics
Emission
Fine structure
Plasma resonance
Plasmons
Superconductivity
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Zusammenfassung:In the present investigation (2002) the current-voltage characteristics (CVCs) of break junctions in polycrystalline \(MgB_2\) samples have been studied in the temperature range \(4.2 K < T < T_c\). An inelastic Cooper pair tunneling accompanied by the emission of Leggett plasmons has been found for the first time in \(MgB_2\) Josephson contacts. A fine structure in the CVCs of \(MgB_2\) Andreev point contacts caused by a resonant emission of Leggett plasmons has been observed for the first time. An energy of the Leggett plasmon has been estimated: \(E_0\) ~ 4 meV. Distinct two-gap structures have been found in the CVCs of \(MgB_2\) tunneling contacts and \(MgB_2\) Andreev point contacts with 7.5 meV \(< \Delta_L
ISSN:2331-8422