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$_2$
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912688342302720 |
|---|---|
| author | 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. |
| author_facet | 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. |
| contents | 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 $< Δ_L <$ 11 meV and 1.5 meV $< Δ_S <$ 2.5 meV. An intrinsic tunneling effect (ITE) and intrinsic multiple Andreev reflections effect (IMARE) have been observed due to the layered structure of $MgB_2$. The obtained experimental results give a direct evidence for a two-gap superconductivity in $MgB_2$. ("V. Tarasov's Readings", November 2002, Russia, Moscow, conference proceedings.) |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2301_02929 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | 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$_2$ 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. Superconductivity 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 $< Δ_L <$ 11 meV and 1.5 meV $< Δ_S <$ 2.5 meV. An intrinsic tunneling effect (ITE) and intrinsic multiple Andreev reflections effect (IMARE) have been observed due to the layered structure of $MgB_2$. The obtained experimental results give a direct evidence for a two-gap superconductivity in $MgB_2$. ("V. Tarasov's Readings", November 2002, Russia, Moscow, conference proceedings.) |
| title | 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$_2$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2301.02929 |