Filamentary superconductivity across the phase diagram of Ba(Fe,Co)$_2$As$_2$

We show magnetotransport results on Ba(Fe $_{1 - x}$ Co $_{x}$ ) $_{2}$ As $_{2}$ ($0.0 \leq x \leq 0.13$) single crystals. We identify the low temperature resistance step at 23 K in the parent compound with the onset of filamentary superconductivity (FLSC), which is suppressed by an applied magnetic field in a similar manner to the suppression of bulk superconductivity (SC) in doped samples. FLSC is found to persist across the phase diagram until the long range antiferromagnetic order is completely suppressed. A significant suppression of FLSC occurs for $0.02 < x < 0.04$ , the doping concentration where bulk SC emerges. Based on these results and the recent report of an electronic anisotropy maximum for 0.02 $\leq x \leq$ 0.04 [Science 329, 824 (2010)], we speculate that, besides spin fluctuations, orbital fluctuations may also play an important role in the emergence of SC in iron-based superconductors.

Filamentary superconductivity across the phase diagram of Ba(Fe,Co) $_{2}$ As $_{2}$

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Filamentary superconductivity across the phase diagram of Ba(Fe,Co) $_{2}$ As $_{2}$

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Filamentary superconductivity across the phase diagram of Ba(Fe,Co)22​As22​

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Filamentary superconductivity across the phase diagram of Ba(Fe,Co)22​As22​

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Filamentary superconductivity across the phase diagram of Ba(Fe,Co) $_{2}$ As $_{2}$

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Filamentary superconductivity across the phase diagram of Ba(Fe,Co) $_{2}$ As $_{2}$

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