Maximizing flux pinning in YBCO coated conductor films for high-field applications
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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)
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.
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)
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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