Výsledky vyhledávání - "Ya. G. Ponomarev"

Study of the structure of a superconducting state of Co-doped BaFe2As2 multiband compounds

Autor: Elena S. Zhukova, Silvia Haindl, A. E. Karakozov, A. S. Prokhorov, Kazumasa Iida, M. V. Magnitskaya, Ya. G. Ponomarev, Boris Gorshunov, V. S. Nozdrin, Sina Zapf, Martin Dressel

Publikováno v: JETP Letters. 100:328-335

The terahertz and infrared spectra of the complex dynamic conductivity, as well as the temperature dependences of the density of a superconducting condensate and the electronic specific heat of superconducting Ba(Fe1 − x Co x )2As2 compounds, have

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cb3d9b785d3aab6eff358f6721996c28
https://doi.org/10.1134/s002136401417007x

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Andreev spectroscopy of iron-based superconductors: temperature dependence of the order parameters and scaling of $ \Delta_{\rm L, S}$ with $ T_{\rm C}$

Autor: S. A. Kuzmichev, E. P. Khlybov, V. M. Pudalov, Nikolai D. Zhigadlo, S. N. Tchesnokov, T. E. Kuzmicheva, M. G. Mikheev, Ya. G. Ponomarev

Publikováno v: Physics-Uspekhi. 57:819-827

We studied iron-based superconductors of various families with critical temperatures covering almost all range $T_C = 9 - 53$ K. In natural arrays of contacts formed in these materials we observed intrinsic multiple Andreev reflections effect (IMARE)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ae11da8d43d5e57b162f7dc6d08e6ac
https://doi.org/10.3367/ufne.0184.201408i.0888

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Leggett mode in cuprate superconductors and the electromagnetic properties of Josephson junctions

Autor: O. V. Belyaeva, Ya. G. Ponomarev, L. M. Fisher, S. V. Kulbachinskii

Publikováno v: JETP Letters. 96:35-39

The effect of multiple Andreev reflections in YBa2Cu3O7 − x and Tl2Ba2Ca2Cu3O10 − δ has been studied. Several independent subharmonic gap structures associated with the multigap character of these superconductors have been revealed on the I(V) a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cb4c7f9e6891b6e7bf3ad14cd969c03e
https://doi.org/10.1134/s0021364012130085

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Theoretical analysis of two-gap superconductivity of magnesium diborades and iron pnictides in the generalized α model

Autor: Martin Dressel, Elena S. Zhukova, Boris Gorshunov, Ya. G. Ponomarev, Evgenii G. Maksimov, A. E. Karakozov

Publikováno v: Journal of Experimental and Theoretical Physics. 115:252-262

A generalized α model for computing the superconducting parameters of real two-band superconductors is proposed based on an analysis of the properties of two-band equations in the theory of superconductivity. Using this model, we calculate the heat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4700f91c1268d2c3f86a917919c64f73
https://doi.org/10.1134/s1063776112060088

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THZ Phonon Spectroscopy of Bi-2223 and Bi-2212: Evidence for Phonon Pairing

Autor: Hoang Hoai Van, Ya. G. Ponomarev

Publikováno v: Physics Procedia. 36:611-616

Facts are presented evidencing the strong electron–phonon interaction and the scaling of a superconducting gap and a critical temperature in doped Bi-2212 single crystals. A sharp extra structure in the current-voltage characteristics (CVC's) of Bi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b36c3712a7647ec1a5b69e30a1191b03

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Andreev spectroscopy of FeSe: Evidence for two-gap superconductivity

Autor: Ya. G. Ponomarev, S. N. Tchesnokov, M. G. Mikheev, Alexander N. Vasiliev, Th. Wolf, M. V. Sudakova, T. E. Shanygina, S. A. Kuzmichev, Olga S. Volkova

Publikováno v: Journal of Experimental and Theoretical Physics. 113:459-467

Current-voltage characteristics (CVCs) of Andreev superconductor-constriction-superconductor (ScS) contacts in polycrystalline samples of FeSe with the critical temperature T C = (12 ± 1) K have been measured using the break-junction technique. In S

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8f0d57816c919b029c08d39a94683094
https://doi.org/10.1134/s1063776111080097

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Observation of multi-gap superconductivity in GdO(F)FeAs by Andreev spectroscopy

Autor: E. P. Khlybov, M. G. Mikheev, S. A. Kuzmichev, A. S. Dormidontov, A. V. Sadakov, S. N. Tchesnokov, Yu. Eltsev, V. M. Pudalov, Ya. G. Ponomarev, T. E. Shanygina, A. S. Usoltsev, O. E. Omel’yanovskii

Publikováno v: JETP Letters. 93:94-98

We have studied current-voltage characteristics of Andreev contacts in polycrystalline GdO$_{0.88}$F$_{0.12}$FeAs samples with bulk critical temperature ${T_c}$ = (52.5 \pm 1)K using break-junction technique. The data obtained cannot be described wit

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::699f96cdc3ecd09dcdcb8b93090cd9dc
https://doi.org/10.1134/s0021364011020111

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Theoretical analysis of tunneling experiments in the MgB2 system

Autor: Evgenii G. Maksimov, Ya. G. Ponomarev, A. E. Karakozov

Publikováno v: JETP Letters. 91:24-29

A detailed theoretical analysis of the experimental data obtained earlier in the studies of the tunneling spectra in the MgB2 two-band superconducting system has been performed. It is shown that most these data are well described in the generalized t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2dd6c418583bd080b09d81d9fb956dd0
https://doi.org/10.1134/s0021364010010066

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Leggett’s mode in Mg1−x AlxB2

Autor: S. I. Krasnosvobodtsev, Hoang Van Hoai, Evgenii G. Maksimov, S. A. Kuzmichev, S. N. Tchesnokov, M. G. Mikheev, Ya. G. Ponomarev, Boris M. Bulychev, M. V. Sudakova

Publikováno v: JETP Letters. 85:46-50

A detailed investigation of multiband superconductivity and Leggett’s mode in the Mg1−x AlxB2 (0 ≤ x ≤ 0.45) system was carried out using tunneling and Andreev spectroscopy. Temperature dependences of superconducting gaps Δσ and Δπ and th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::69e3c6ba321057465199c76f549ee2af
https://doi.org/10.1134/s0021364007010092

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Evidence for a two-band behavior of MgB2 from point-contact and tunneling spectroscopy

Autor: Helmut Piel, S. N. Tchesnokov, Boris M. Bulychev, S.I. Krasnosvobodtsev, K. P. Burdina, A. V. Yarigin, Ya. G. Ponomarev, Matthias Hein, N. Z. Timergaleev, M. G. Mikheev, G. Müller, M. V. Sudakova, S. A. Kuzmichev, Evgenii G. Maksimov, A.V. Varlashkin, O. V. Kravchenko, L.G. Sevastyanova

Publikováno v: Solid State Communications. 129:85-89

The break-junction tunneling has been systematically investigated in MgB2. Two types of the break-junction contacts have been exploited on the same samples, which demonstrated tunnel contact like (SIS) and point contact like (SnS) behavior. Both of t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b3ea0482f6e5b0a1941f80ca4032ff86
https://doi.org/10.1016/j.ssc.2003.09.024

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