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 studied by the p...
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| Дата: | 2014 |
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| Формат: | Стаття |
| Мова: | Russian |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2014
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| Назва видання: | Физика низких температур |
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| Цитувати: | 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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irk-123456789-1196692017-06-09T03:03:05Z 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 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. 2014 Article 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 http://dspace.nbuv.gov.ua/handle/123456789/119669 ru Физика низких температур Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
Russian |
| topic |
III Международный семинар по микроконтактной спектроскопии III Международный семинар по микроконтактной спектроскопии |
| spellingShingle |
III Международный семинар по микроконтактной спектроскопии III Международный семинар по микроконтактной спектроскопии Krivoruchko, V.N. D’yachenko, A.I. Tarenkov, V.Yu. Andreev-spectroscopy study of unconventional superconductivity in MgB₂:(La,Sr)MnO₃ nanocomposite 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. |
| format |
Article |
| author |
Krivoruchko, V.N. D’yachenko, A.I. Tarenkov, V.Yu. |
| author_facet |
Krivoruchko, V.N. D’yachenko, A.I. Tarenkov, V.Yu. |
| author_sort |
Krivoruchko, V.N. |
| title |
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_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_sort |
andreev-spectroscopy study of unconventional superconductivity in mgb₂:(la,sr)mno₃ nanocomposite |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| publishDate |
2014 |
| topic_facet |
III Международный семинар по микроконтактной спектроскопии |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/119669 |
| 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. |
| series |
Физика низких температур |
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2023-10-18T20:35:08Z |
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