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Paper detail

Optical properties of the iron-pnictide analog BaMn2As2

We have investigated the infrared and Raman optical properties of BaMn2As2 in the ab-plane and along the c-axis. The most prominent features in the infrared spectra are the Eu and A2u phonon modes which show clear TO-LO splitting from the energy loss function analysis. All the phonon features we observed in infrared and Raman spectra are consistent with the calculated values. Compared to the iron-pnictide analog AFe2As2, this compound is much more two-dimensional in its electronic properties. For E || c-axis, the overall infrared reflectivity is insulating like. Within the ab-plane the material exhibits a semiconducting behavior. An energy gap 2Δ=48 meV can be clearly identified below room temperature.

preprint2012arXivOpen access
A. AntalT. KnoblauchY. SinghP. GegenwartD. WuM. Dressel
cond-mat.supr-con
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A. AntalT. KnoblauchY. SinghP. GegenwartD. WuM. Dressel

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