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GIST Scholar College of Engineering Department of Materials Science and Engineering 1. Journal Articles

Dual character of magnetism in EuFe2As2: Optical spectroscopic and density-functional calculation study

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Author(s)
Moon, S. J.; Shin, J. H.; Parker, D.; Choi, W. S.; Mazin, I. I.; Lee, Y. S.; Kim, J. Y.; Sung, N. H.; Cho, Beong Ki; Khim, S. H.; Kim, J. S.; Kim, K. H.; Noh, T. W.
Type
Article
Citation
Physical Review B - Condensed Matter and Materials Physics, v.81, no.20
Issued Date
2010-05
Abstract
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.
Publisher
American Physical Society
ISSN
1098-0121
DOI
10.1103/PhysRevB.81.205114
URI
https://scholar.gist.ac.kr/handle/local/16720
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