Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite
Unconventional high-temperature superconductivity in MgB₂:La₀:₆₅Sr₀:₃₅MnO₃ (MgB:LSMO) nanocomposite
 has been found recently [Phys. Rev. B 86, 10502 (2012)]. In this report, the symmetry of the nanocomposite
 superconducting order parameter and plausible pairing mechanisms have been...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 2014 |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2014
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| Zitieren: | Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite / V.N. Krivoruchko, A.I. D’yachenko, V.Yu. Tarenkov // Физика низких температур. — 2014. — Т. 40, № 10. — С. 1147-1154. — Бібліогр.: 38 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862530548449148928 |
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| author | Krivoruchko, V.N. D’yachenko, A.I. Tarenkov, V.Yu. |
| author_facet | Krivoruchko, V.N. D’yachenko, A.I. Tarenkov, V.Yu. |
| citation_txt | Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite / V.N. Krivoruchko, A.I. D’yachenko, V.Yu. Tarenkov // Физика низких температур. — 2014. — Т. 40, № 10. — С. 1147-1154. — Бібліогр.: 38 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | Unconventional high-temperature superconductivity in MgB₂:La₀:₆₅Sr₀:₃₅MnO₃ (MgB:LSMO) nanocomposite
has been found recently [Phys. Rev. B 86, 10502 (2012)]. In this report, the symmetry of the nanocomposite
superconducting order parameter and plausible pairing mechanisms have been studied by the point-contact
Andreev-reflection (PCAR) spectroscopy. To clarify the experimental results obtained, we consider a model
of a ferromagnetic superconductor, which assumes a coexistence of itinerant ferromagnetism and mixed-parity
superconductivity. The Balian–Werthamer state, with quasiparticle gap topology of the same form as that
of the ordinary s-wave state, fits the experimental data reasonably well. Utilizing the extended Eliashberg formalizm,
we calculated the contribution of MgB₂ in the total composite’s conductivity and estimated the magnitude
of the electron–phonon effects originated from MgB₂ in I–V characteristics of the composite at above-gap
energies. It was found that distinctive features observed in the PC spectra of the MgB:LSMO samples and conventionally
attributed to the electron–phonon interaction cannot be related to the MgB₂ phonons. It is argued that
the detected singularities may be a manifestation of the electron-spectrum renormalizations due to strong
magnetoelastic (magnon–phonon) interaction in LSMO.
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| first_indexed | 2025-11-24T02:24:16Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-119669 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | Russian |
| last_indexed | 2025-11-24T02:24:16Z |
| publishDate | 2014 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Krivoruchko, V.N. D’yachenko, A.I. Tarenkov, V.Yu. 2017-06-08T04:33:20Z 2017-06-08T04:33:20Z 2014 Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite / V.N. Krivoruchko, A.I. D’yachenko, V.Yu. Tarenkov // Физика низких температур. — 2014. — Т. 40, № 10. — С. 1147-1154. — Бібліогр.: 38 назв. — англ. 0132-6414 PACS 74.45.+c, 74.78.–w, 74.20.Rp, 74.81.–g https://nasplib.isofts.kiev.ua/handle/123456789/119669 Unconventional high-temperature superconductivity in MgB₂:La₀:₆₅Sr₀:₃₅MnO₃ (MgB:LSMO) nanocomposite
 has been found recently [Phys. Rev. B 86, 10502 (2012)]. In this report, the symmetry of the nanocomposite
 superconducting order parameter and plausible pairing mechanisms have been studied by the point-contact
 Andreev-reflection (PCAR) spectroscopy. To clarify the experimental results obtained, we consider a model
 of a ferromagnetic superconductor, which assumes a coexistence of itinerant ferromagnetism and mixed-parity
 superconductivity. The Balian–Werthamer state, with quasiparticle gap topology of the same form as that
 of the ordinary s-wave state, fits the experimental data reasonably well. Utilizing the extended Eliashberg formalizm,
 we calculated the contribution of MgB₂ in the total composite’s conductivity and estimated the magnitude
 of the electron–phonon effects originated from MgB₂ in I–V characteristics of the composite at above-gap
 energies. It was found that distinctive features observed in the PC spectra of the MgB:LSMO samples and conventionally
 attributed to the electron–phonon interaction cannot be related to the MgB₂ phonons. It is argued that
 the detected singularities may be a manifestation of the electron-spectrum renormalizations due to strong
 magnetoelastic (magnon–phonon) interaction in LSMO. The authors thanks to M. Belogolovskii, A. Omelyanchouk, and Yu. Naidyuk for useful discussions. ru Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур III Международный семинар по микроконтактной спектроскопии Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite Article published earlier |
| spellingShingle | Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite Krivoruchko, V.N. D’yachenko, A.I. Tarenkov, V.Yu. III Международный семинар по микроконтактной спектроскопии |
| title | Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite |
| title_full | Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite |
| title_fullStr | Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite |
| title_full_unstemmed | Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite |
| title_short | Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite |
| title_sort | andreev-spectroscopy study of unconventional superconductivity in mgb₂:(la,sr)mno₃ nanocomposite |
| topic | III Международный семинар по микроконтактной спектроскопии |
| topic_facet | III Международный семинар по микроконтактной спектроскопии |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/119669 |
| work_keys_str_mv | AT krivoruchkovn andreevspectroscopystudyofunconventionalsuperconductivityinmgb2lasrmno3nanocomposite AT dyachenkoai andreevspectroscopystudyofunconventionalsuperconductivityinmgb2lasrmno3nanocomposite AT tarenkovvyu andreevspectroscopystudyofunconventionalsuperconductivityinmgb2lasrmno3nanocomposite |