Optical properties of the iron-pnictide analog BaMn2As2

A. Antal; T. Knoblauch; Y. Singh; P. Gegenwart; D. Wu; M. Dressel

doi:10.1103/PhysRevB.86.014506

Optical properties of the iron-pnictide analog BaMn2As2

Superconductivity 2012-07-11 v1

Authors: A. Antal , T. Knoblauch , Y. Singh , P. Gegenwart , D. Wu , M. Dressel

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Abstract

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 2{\Delta}=48 meV can be clearly identified below room temperature.

Keywords

optical properties baMn2As2 iron-pnictide analog infrared spectroscopy raman spectroscopy phonon modes energy gap

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@article{arxiv.1207.2360,
  title  = {Optical properties of the iron-pnictide analog BaMn2As2},
  author = {A. Antal and T. Knoblauch and Y. Singh and P. Gegenwart and D. Wu and M. Dressel},
  journal= {arXiv preprint arXiv:1207.2360},
  year   = {2012}
}

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5 pages, 7 figures

Optical properties of the iron-pnictide analog BaMn2As2

Abstract

Keywords

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