Weak-link behavior of grain boundaries in superconducting Ba(Fe1-xCox)(2)As-2 bicrystals

作者：Lee S^*; Jiang J; Weiss J D; Folkman C M; Bark C W; Tarantini C; Xu A; Abraimov D; Polyanskii A; Nelson C T; Zhang Y; Baek S H; Jang H W; Yamamoto A; Kametani F; Pan X Q; Hellstrom E E; Gurevich A; Eom C B; Larbalestier D C

来源：Applied Physics Letters, 2009, 95(21): 212505.

DOI：10.1063/1.3262953

• arsenic alloys
• barium alloys
• carrier density
• cobalt alloys
• critical current density (superconductivity)
• flux pinning
• grain boundaries
• iron alloys
• superconducting junction devices

We show that despite the low anisotropy, strong vortex pinning, and high irreversibility field H-irr close to the upper critical field H-c2 of Ba(Fe1-xCox)(2)As-2, the critical current density J(gb) across [001] tilt grain boundaries (GBs) of thin film Ba(Fe1-xCox)(2)As-2 bicrystals is strongly depressed, similar to high-T-c cuprates. Our results suggest that weak-linked GBs are characteristic of both cuprates and pnictides because of competing orders, low carrier density, and unconventional pairing symmetry.

• 出版日期2009-11-23