Journal
NATURE COMMUNICATIONS
Volume 2, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms1394
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Funding
- Chinese Academy of Sciences
- NSF [DMR-0537588]
- Ministry of Science and Technology of China
- TRiP-JST
- CREST-JST
- JSPS
- MEXT of Japan
- DOE of US
- Grants-in-Aid for Scientific Research [21340088] Funding Source: KAKEN
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [704545] Funding Source: National Science Foundation
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High-temperature superconductivity in iron-arsenic materials (pnictides) near an anti-ferromagnetic phase raises the possibility of spin-fluctuation-mediated pairing. However, the interplay between antiferromagnetic fluctuations and superconductivity remains unclear in the underdoped regime, which is closer to the antiferromagnetic phase. Here we report that the superconducting gap of underdoped pnictides scales linearly with the transition temperature, and that a distinct pseudogap coexisting with the superconducting gap develops on under-doping. This pseudogap occurs on Fermi surface sheets connected by the antiferromagnetic wavevector, where the superconducting pairing is stronger as well, suggesting that antiferromagnetic fluctuations drive both the pseudogap and superconductivity. Interestingly, we found that the pseudogap and the spectral lineshape vary with the Fermi surface quasi-nesting conditions in a fashion that shares similarities with the nodal-antinodal dichotomous behaviour observed in underdoped copper oxide superconductors.
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