Journal
PHYSICAL REVIEW B
Volume 81, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.205114
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Funding
- Ministry of Education, Science and Technology (MEST) [2009-0080567, 2009-0076978, 2009-0078928, M10600000238]
- National Research Foundation of Korea [2009-0076978] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We investigate the electronic structure of EuFe2As2 using optical spectroscopy and density-functional calculations. At low temperature we observe the evolution of two gaplike features, one having a weak-coupling mean-field behavior and another with strongly nonmean-field behavior. Using band-structure calculations, we identify the former with a spin-Peierls-type partial gap in d(yz) bands and the latter with the transition across the large exchange gap in d(xz)/d(xy) bands. Our results demonstrate that the antiferromagnetism in the ferropnictides is neither fully local nor fully itinerant but contains elements of both.
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