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arXiv · 1204.0584

Evidence of the influence of magnetism on pseudogap states in the high resolution spectra of EuFe$_2$As$_2$

Ganesh Adhikary·Nishaina Sahadev·Deep Narayan Biswas·R. Bindu·Neeraj Kumar·A. Thamizhavel·S. K. Dhar·Kalobaran Maiti
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Abstract

Employing {\it state of the art} high resolution photoemission spectroscopy, we studied the temperature evolution of the electronic structure of EuFe$_2$As$_2$, an unique pnictide, where antiferromagnetism of Eu layer survives within the superconducting phase due to `FeAs' layers achieved via substitution and/or pressure. High energy and angle resolution helped to reveal pseudogap-quasiparticle features having primarily As 4$p$ character and spin density wave transition induced band folding in the electronic structure. A weakly dispersing feature of dominant As 4$p$ character is discovered around 80 meV that becomes weaker in intensity below 20 K manifesting influence of antiferromagnetic order on conduction electrons. These results provide an evidence of a link between the pseudogap states and magnetism that could be revealed employing high resolutions.

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Ganesh Adhikary, Nishaina Sahadev, Deep Narayan Biswas, R. Bindu, Neeraj Kumar, A. Thamizhavel, S. K. Dhar, Kalobaran Maiti. 2012-04-03. Evidence of the influence of magnetism on pseudogap states in the high resolution spectra of EuFe$_2$As$_2$. https://arxiv.org/abs/1204.0584

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