Details

Autor(en) / Beteiligte

• Fang, L
• Jia, Y
• Mishra, V
• Chaparro, C
• Vlasko-Vlasov, V K
• Koshelev, A E
• Welp, U
• Crabtree, G W
• Zhu, S
• Zhigadlo, N D
• Katrych, S
• Karpinski, J
• Kwok, W K

Titel

Huge critical current density and tailored superconducting anisotropy in SmFeAsO₀.₈F₀.₁₅ by low-density columnar-defect incorporation

Ist Teil von

• Nature communications, 2013-11, Vol.4 (1), p.2655-2655, Article 2655

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Iron-based superconductors could be useful for electricity distribution and superconducting magnet applications because of their relatively high critical current densities and upper critical fields. SmFeAsO₀.₈F₀.₁₅ is of particular interest as it has the highest transition temperature among these materials. Here we show that by introducing a low density of correlated nano-scale defects into this material by heavy-ion irradiation, we can increase its critical current density to up to 2 × 10⁷ A cm⁻² at 5 K--the highest ever reported for an iron-based superconductor--without reducing its critical temperature of 50 K. We also observe a notable reduction in the thermodynamic superconducting anisotropy, from 8 to 4 upon irradiation. We develop a model based on anisotropic electron scattering that predicts that the superconducting anisotropy can be tailored via correlated defects in semimetallic, fully gapped type II superconductors.