Optical spectroscopy study on single crystalline LaFeAsO

Details Optical spectroscopy study on single crystalline LaFeAsO Optical spectroscopy study on single crystalline LaFeAsO

2009-10-07

arxiv.org/abs/0910.1318v2

Phys. Rev. B 81, 100502(R) (2010)

Physics

Condensed Matter

Superconductivity

4 figures, 5 pages

Scientific paper

Millimeter-sized single crystals of LaFeAsO were grown from NaAs flux and the in-plane optical properties were studied over a wide frequency range. A sizable electronic correlation effect was indicated from the analysis of the free-carrier spectral weight. With decreasing temperature from 300 K, we observed a continuous suppression of the spectral weight near 0.6 eV. But a spin-density-wave gap formation at lower energy scale was seen only in the broken-symmetry state. We elaborate that both the itinerancy and local spin interactions of Fe\emph{3d} electrons are present for the FeAs-based systems; however, the establishment of the long-range magnetic order at low temperature has a dominantly itinerant origin.

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