Proton Irradiation Effects on the Superconducting Properties of Fe(Se,Te) Thin Films

Torsello, Daniele; Fracasso, Michela; Gerbaldo, Roberto; Ghigo, Gianluca; Laviano, Francesco; Napolitano, Andrea; Iebole, Michela; Cialone, Matteo; Manca, Nicola; Martinelli, A.; Piperno, Laura; Braccini, V.; Leo, Antonio; Grimaldi, Gaia; Vannozzi, Angelo; Celentano, G.; Putti, M.; Gozzelino, Laura

doi:10.1109/tasc.2021.3136135

Cited by 7 publications

(3 citation statements)

References 44 publications

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“…A second (more relevant) aspect to be considered in future works is that of the complex structure of 2G HTS tapes and of the radiation damage in the buffer layers. It has been shown for several systems that substrate damage can influence the properties of the superconducting layer [29][30][31] due to the modified strain level at the interface. However, the effects due to the interface can even be beneficial [32], and need to be investigated with ad hoc simulations and experiments.…”

Section: Additional Effects From a Realistic Tape Structurementioning

confidence: 99%

Expected radiation environment and damage for YBCO tapes in compact fusion reactors

Torsello¹,

Gambino²,

Gozzelino³

et al. 2022

Supercond. Sci. Technol.

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We investigate the neutron damage expected in the high temperature superconducting tapes that will be employed in compact fusion reactors. Monte Carlo simulations yield the expected neutron spectrum and fluence at the magnet position, from which the primary knock on atom energy distributions can be computed for each atomic species composing the superconductor. This information is then employed to characterize the displacement cascades, in terms of size and morphology, through Molecular Dynamics simulations. The expected radiation environment is then compared to the neutron spectrum and fluences achievable at the facilities currently available for experimental investigation, in order to highlight similarities and differences that could be relevant to the understanding of the radiation hardness of these materials in real fusion conditions. We find that the different neutron spectra result in different damage regimes, the irradiation temperature influences the amount of the generated defects, and the interaction of the neutrons with the superconductor results in a local increase of temperature. These observations suggest that further experimental investigations in different regimes are needed, and that some neutron shielding will be necessary in compact fusion reactors.

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Section: Additional Effects From a Realistic Tape Structurementioning

confidence: 99%

Expected radiation environment and damage for YBCO tapes in compact fusion reactors

Torsello¹,

Gambino²,

Gozzelino³

et al. 2022

Supercond. Sci. Technol.

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“…Particle irradiation is an alternative way to generate scattering centers, and it has been intensively used to investigate the properties of materials. Depending on the choice of particles, the character of induced scattering centers varies from point-like defects, mostly vacancies (electron irradiation) [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ], to dendritic clusters (proton irradiation) [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ], and to columnar defects (heavy-ion irradiation) [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. Furthermore, if the energy of the projectile particles varies, the character of defects generated also changes accordingly since the scattering dynamics significantly vary with the energy [ 39 , 40 ].…”

Section: Introductionmentioning

confidence: 99%

Ion-Selective Scattering Studied Using the Variable-Energy Electron Irradiation in the Ba0.2K0.8Fe2As2 Superconductor

et al. 2023

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Low-temperature variable-energy electron irradiation was used to induce non-magnetic disorder in a single crystal of a hole-doped iron-based superconductor, Ba1−xKxFe2As2, x = 0.80. To avoid systematic errors, the beam energy was adjusted non-consequently for five values between 1.0 and 2.5 MeV when sample resistance was measured in situ at 22 K. For all energies, the resistivity raises linearly with the irradiation fluence suggesting the creation of uncorrelated dilute point-like disorder (confirmed by simulations). The rate of the resistivity increase peaks at energies below 1.5 MeV. Comparison with calculated partial cross-sections points to the predominant creation of defects in the iron sublattice. Simultaneously, superconducting Tc, measured separately between the irradiation runs, is monotonically suppressed as expected, since it depends on the total scattering rate, hence on the total cross-section, which is a monotonically increasing function of the energy. Our work experimentally confirms an often-made assumption of the dominant role of the iron sub-lattice in iron-based superconductors.

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“…In view of large-scale power applications conductors in form of wires or tapes are required. Several works show that Fe(Se,Te) can be successfully obtained in form of tapes [8][9][10][11][12][13][14] by exploiting the same technology developed and commercialized for High Temperature Superconductor (HTS) REBCO materials (REBCO, Rare Earth-Barium-Copper Oxide), the so called coated conductors (CCs). This technology is based on biaxially textured superconducting films on metallic substrates 8,10,[15][16][17] , however their potentiality for applications is strongly limited by costs, ultimately related to the high degree of manufacturing process complexity.…”

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confidence: 99%

High-performance Fe(Se,Te) films on chemical CeO2-based buffer layers

Piperno

Vannozzi

Augieri

et al. 2023

Sci Rep

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The fabrication of a Fe-based coated conductor (CC) becomes possible when Fe(Se,Te) is grown as an epitaxial film on a metallic oriented substrate. Thanks to the material’s low structural anisotropy, less strict requirements on the template microstructure allow for the design of a simplified CC architecture with respect to the REBCO multi-layered layout. This design, though, still requires a buffer layer to promote the oriented growth of the superconducting film and avoid diffusion from the metallic template. In this work, Fe(Se,Te) films are grown on chemically-deposited, CeO2-based buffer layers via pulsed laser deposition, and excellent properties are obtained when a Fe(Se,Te) seed layer is used. Among all the employed characterization techniques, transmission electron microscopy proved essential to determine the actual effect of the seed layer on the final film properties. Also, systematic investigation of the full current transport properties J(θ, H, T) is carried out: Fe(Se,Te) samples are obtained with sharp superconducting transitions around 16 K and critical current densities exceeding 1 MA cm−2 at 4.2 K in self-field. The in-field and angular behavior of the sample are in line with data from the literature. These results are the demonstration of the feasibility of a Fe-based CC, with all the relative advantages concerning process simplification and cost reduction.

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Proton Irradiation Effects on the Superconducting Properties of Fe(Se,Te) Thin Films

Cited by 7 publications

References 44 publications

Expected radiation environment and damage for YBCO tapes in compact fusion reactors

Expected radiation environment and damage for YBCO tapes in compact fusion reactors

Ion-Selective Scattering Studied Using the Variable-Energy Electron Irradiation in the Ba0.2K0.8Fe2As2 Superconductor

High-performance Fe(Se,Te) films on chemical CeO2-based buffer layers

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