Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.027006
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Funding
- National Science Foundation [NSF 1005493]
- AFOSR
- National Research Foundation of Korea
- Ministry of Education, Science, and Technology [2012R1A1A1013274]
- U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering [DE-AC02-07CH11358]
- U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
- National Research Foundation of Korea [2012R1A1A1013274] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1005493] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [23654118, 20224008, 23654119, 23102713, 20102006, 24654103] Funding Source: KAKEN
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We report on infrared studies of charge dynamics in a prototypical pnictide system: the BaFe2As2 family. Our experiments have identified hallmarks of the pseudogap state in the BaFe2As2 system that mirror the spectroscopic manifestations of the pseudogap in the cuprates. The magnitude of the infrared pseudogap is in accord with that of the spin-density-wave gap of the parent compound. By monitoring the superconducting gap of both P- and Co-doped compounds, we find that the infrared pseudogap is unrelated to superconductivity. The appearance of the pseudogap is found to correlate with the evolution of the antiferromagnetic fluctuations associated with the spin-density-wave instability. The strong-coupling analysis of infrared data further reveals the interdependence between the magnetism and the pseudogap in the iron pnictides.
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