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Registration Number

0225U002556, (0122U001302) , R & D reports

Title

Heat and charge transfer in iron-based nanocomposite compounds: electroconsolidated permalloys and iron-containing superconductors

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Дослідження штучних надпровідних гетероструктур.

Head

Vovk Ruslan V., Доктор фізико-математичних наук

Registration Date

19-03-2025

Organization

V.N. Karazin Kharkiv National University

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Investigation of the relationship between composite composition and electroconsolidation conditions on the one hand, and transport and magnetic characteristics on the other hand, for composite permaloids; establishment of mechanisms for dissipation of heat and charge carriers in iron-containing superconductors in a wide range of temperatures; study of transport properties and energy dissipation in HTSC with twins or artificial places of pinning with transport current in magnetic field depending on temperature, magnetic field and transport current

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 Object of research: processes of scattering of charge carriers and heat in iron-containing superconductor FeSe, electroconsolidated metallic composite Fe–Ni and in high-temperature superconductors Y-Ba-Cu-O. Research method: experimental determination of electrical resistance and thermal conductivity in the range 4.2–300 K; analysis of the obtained dependences. The aim of the study: to establish the mechanisms of charge carrier and heat dissipation in FeSe, Fe–Ni and in the Y-Ba-Cu-O HTSС. The temperature dependences of the electrical resistance and thermal conductivity in the range of 4.2–300 K of the iron-containing superconductor FeSe0.94 after annealing at room temperature in air for 7 years; of the electroconsolidated equiatomic Fe–Ni were studied. For the Y-Ba-Cu-O HTSC, the effect of irradiation (electrons E0.5–2.5 MeV, fluences up to 70·1018 cm–2) on the electrical resistivity in the range Tc–300 K was studied. The transport of charge and heat in these materials is limited by the scattering of carriers on phonons and defects. Long-term annealing of FeSe0.94 led to a significant decrease in the superconducting transition temperature, an increase in the defectivity and an intensification of phonon-phonon scattering. The thermal and electrical conductivity of electroconsolidated Fe–Ni are higher than the corresponding values of molten samples and can be theoretically estimated. Irradiation of Y-Ba-Cu-O HTSC leads to the appearance of a significant number of defects, which causes a decrease in anisotropy, intensification of scattering processes, a decrease in Tc and an expansion of the superconducting transition.

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Vovk Ruslan V.
Kyslytsia Maksym V.
Korobkov Maksym V
Obolenskyi Yevhen M.
Samsonik Oleksandr L.
Khadzhai Heorhii Ya.
Kholodilova Ludmila T.
Chykina Olena L.

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2025-03-19