Enhanced critical current density in optimized high-temperature superconducting bilayer thin films

Rivasto, E; Aye, M M; Huhtinen, H; Paturi, P

doi:10.1088/1361-648x/ad162c

Cited by 5 publications

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“…In chemical solution deposition methods, seed layers are needed [30] to ensure the proper growth of the film. Recent theoretical and experimental results observed in [31][32][33] confirm that the performance of conventional HTS films can be greatly enhanced by using bilayers based on YBCO/YBCO+BZO heterostructures on single crystalline STO substrates. The bilayer structure, consisting of approximately 30% YBCO and 70% YBCO+6wt% BZO, was found to be optimal across a wide range of magnetic fields and temperatures, resulting in an almost 60% increase in the critical current density compared to single layer films.…”

Section: Introductionmentioning

confidence: 80%

“…For a coated conductor technology, bilayers have the potential to be a significant advancement due to its effectiveness and more simple manufacturing process than needed for multilayers. However, films grown on buffered metal substrates typically contain significantly more crystalline defects than films on single crystals and thus the conclusions of [31][32][33] cannot automatically be assumed to hold. Therefore, in this study, we deposited bilayer structures on a buffered metal Hastelloy C276 substrate.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced current-carrying capability in YBCO coated conductor bilayers for high-field applications

Aye,

Rivasto,

Zhao

et al. 2024

Phys. Scr.

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We have investigated the impact of bilayer structures on the critical current density, J c, of YBa2Cu3O6+x (YBCO) coated conductor films, i.e. films grown on buffered metal substrates, under varying temperature and magnetic field conditions. The bilayers consisted of a YBCO layer free of artificial pinning centers and 8 wt% BaZrO3-added (BZO) layer on top, where the thickness percentage of the layers was varied from 0 to 100 %. The results reveal that the bilayer configuration enhances J c at temperatures below 60 K, with a significant improvement in high magnetic fields (5–8 T) and temperatures ≤20 K. The optimal BZO-added layer thickness was found to be approximately 70 %, reaching 80 % at 8 T. Structural examinations indicate improved growth of YBCO and BZO nanorods in the bilayer structure with BZO-added layer thickness ≤80 %. Theoretical model of the bilayer structure considering the layers as two parallel superconductors with different properties was developed. It was found that the model adequately explains all the experimentally observed tendencies, and thus the observed maximum in J c is due to better growth of the BZO-added layer. The study provides valuable insights for designing optimal bilayer structures for diverse applications operating in different temperature and magnetic field regimes.

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Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Enhanced current-carrying capability in YBCO coated conductor bilayers for high-field applications

Aye,

Rivasto,

Zhao

et al. 2024

Phys. Scr.

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The A-15-type superconducting hydride La₄H₂₃: a nanograined structure with low strain, strong electron-phonon interaction, and a moderate level of nonadiabaticity

Talantsev,

Chistyakov

2024

Supercond. Sci. Technol.

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For seven decades by A-15 superconductors we meant metallic A3B alloys (where A is a transition metal, and B is groups IIIB and IVB element) discovered by Hardy and Hulm (Phys. Rev. 89, 884 (1953)). Nb3Ge exhibited the highest superconducting transition temperature, Tc = 23 K, among these alloys. One of these alloys, Nb3Sn, is the primary material in modern applied superconductivity. Recently Guo et al (2024 National Science Reviews nwae149, https://doi.org/10.1093/nsr/nwae149) extended the family of superconductors where the metallic ions arranged in the beta tungsten (A-15) sublattice by observation of Tc,zero = 81 K in La4H23 phase compressed at P = 118 GPa. Despite the La4H23 has much lower Tc in comparison with near-room-temperature superconducting LaH10 phase (Tc,zero = 250 K at P ~ 200 GPa) discovered by Drozdov et al (Nature 569, 531 (2019)), the La4H23 holds the record high Tc within A-15 family. Cross et al (Phys. Rev. B 109, L020503 (2024)) confirmed the high-temperature superconductivity in the compressed La4H23. In this paper, we analyzed available experimental data measured in La4H23 and found that this superconductor exhibits nanograined structure, 5.5 nm ≤ D ≤ 35 nm, low crystalline strain, ε ≤ 0.003, strong electron-phonon coupling interaction, 1.5 ≤ λe-ph≤ 2.55, and moderate level of the nonadiabaticity, 0.18 ≤ ΘD/TF ≤ 0.22 (where ΘD is the Debye temperature, and TF is the Fermi temperature). We found that the derived ΘD/TF and Tc/TF values for the La4H23 phase are similar to the ones in MgB2, cuprates, pnictides, and near-room-temperature superconductors H3S and LaH10.

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London penetration depth in amorphous and crystalline Re–Lu films: Comment on ‘Superconductivity of amorphous and crystalline Re–Lu films’ (Teknowijoyo and Gulian 2024 Supercond. Sci. Technol. 37 035005)

Talantsev

2024

Supercond. Sci. Technol.

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Recently, Teknowijoyo and Gulian (2024 Supercond. Sci. Technol. 37 035005) deposited amorphous Re3.8Lu and polycrystalline Re10.5Lu films and reported several superconducting parameters for these films. One of the reported parameters, the ground-state London penetration depth, λ ( 0 ) ≅ 5 nm , was deduced from the lower critical field, B c 1 ( T ) . The authors also reported the Ginzburg–Landau parameter κ = 0.89 for both films. Based on these values, the authors concluded that their films ‘being of type-II’ are ‘rather close to the theoretical boundary separating type-I and type-II superconductors of κ = 1 / 2 ≈ 0.71 .’ Here, I argue that the reported λ ( 0 ) and κ ( 0 ) are incorrect. It is more likely that the errors originate due to a confusion of CGS and SI units by the authors. The correct parameters deduced from the reported experimental data are larger by 2.5 orders of magnitude, i.e. λ ( 0 ) ≅ 1300 nm and κ ( 0 ) ≅ 250 , which implies that amorphous and polycrystalline Re x Lu films are high- κ type-II superconductors.

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Enhanced critical current density in optimized high-temperature superconducting bilayer thin films

Abstract: The superconducting and structural properties of bilayer thin films based on YBa2Cu3O 7 − x / YBa2Cu3O … Show more

Cited by 5 publications

References 33 publications

Enhanced current-carrying capability in YBCO coated conductor bilayers for high-field applications

Enhanced current-carrying capability in YBCO coated conductor bilayers for high-field applications

The A-15-type superconducting hydride La₄H₂₃: a nanograined structure with low strain, strong electron-phonon interaction, and a moderate level of nonadiabaticity

London penetration depth in amorphous and crystalline Re–Lu films: Comment on ‘Superconductivity of amorphous and crystalline Re–Lu films’ (Teknowijoyo and Gulian 2024 Supercond. Sci. Technol. 37 035005)

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Enhanced critical current density in optimized high-temperature superconducting bilayer thin films

Abstract: The superconducting and structural properties of bilayer thin films based on YBa2Cu3O 7 − x / YBa2Cu3O … Show more

Cited by 5 publications

References 33 publications

Enhanced current-carrying capability in YBCO coated conductor bilayers for high-field applications

Enhanced current-carrying capability in YBCO coated conductor bilayers for high-field applications

The A-15-type superconducting hydride La4H23: a nanograined structure with low strain, strong electron-phonon interaction, and a moderate level of nonadiabaticity

London penetration depth in amorphous and crystalline Re–Lu films: Comment on ‘Superconductivity of amorphous and crystalline Re–Lu films’ (Teknowijoyo and Gulian 2024 Supercond. Sci. Technol. 37 035005)

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The A-15-type superconducting hydride La₄H₂₃: a nanograined structure with low strain, strong electron-phonon interaction, and a moderate level of nonadiabaticity