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Leggett's plasma resonances and two-gap structures in the CVCs of MgB2 break junctions - a direct evidence for a two-gap superconductivity in MgB2статья
- Авторы: Ponomarev Ya G., Kuzmitchev 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.
- Сборник: Bulletin of the V. Tarasov Center of Chemotronics of Glass N2
- Год издания: 2002
- Место издания: Mendeleev University of Chemistry and Technology Russia, Moscow
- Первая страница: 139
- Последняя страница: 146
- Аннотация: In the present investigation 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: Eo ~ 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 < 11 meV and 1.5 meV < \Delta_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 $MgB_2$. ((The first experimental observation of the Leggett collective plasma oscillation. Finally, was published in Solid State Comm. 129, 85 (2004), DOI: 10.1016/j.ssc.2003.09.024))
- Добавил в систему: Судакова Марина Владимировна
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| 1. | Полный текст | Предисловие, скан сборника трудов, оригинальные цветные иллюстрации | 20th_anniversary_of_the_1st_experimental_observation_of_the… | 2,4 МБ | 25 января 2023 [Svetoslav] |