Journal
PHYSICAL REVIEW B
Volume 86, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.064521
Keywords
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Funding
- NSFC [11104335, 2011CBA00107, 2012CB921302]
- National Science Foundation [NSF DMR-1006606, DMR-0844115]
- ICAM Branches Cost Sharing Fund from the Institute for Complex Adaptive Matter
- EURYI, National Research Foundation, Singapore [MEXT-CT-2006-039047]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1006606] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [844115] Funding Source: National Science Foundation
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We show magnetotransport results on Ba(Fe1-xCox)(2)As-2 (0.0 <= x <= 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. Asignificant 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 <= x <= 0.04 [Chu et al., 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.
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