Journal
EUROPEAN PHYSICAL JOURNAL B
Volume 67, Issue 4, Pages 513-517Publisher
SPRINGER
DOI: 10.1140/epjb/e2009-00062-2
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Funding
- Swiss National Foundation for the Scientific Research within the NCCR MaNEP pool
- Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515]
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We report on a thorough optical investigation of BaFe2As2 over a broad spectral range and as a function of temperature, focusing our attention on its spin-density-wave (SDW) phase transition at T-SDW = 135 K. While BaFe2As2 remains metallic at all temperatures, we observe a depletion in the far infrared energy interval of the optical conductivity below T-SDW, ascribed to the formation of a pseudogap-like feature in the excitation spectrum. This is accompanied by the narrowing of the Drude term consistent with the dc transport results and suggestive of suppression of scattering channels in the SDW state. About 20% of the spectral weight in the far infrared energy interval is affected by the SDW phase transition.
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