paper

Angle-resolved photoemission spectroscopy observation of anomalous electronic states in EuFe $_{2}$ As $_{2 - x}$ P $_{x}$

arXiv:1310.7310 · doi:10.1088/0953-8984/26/3/035702

Abstract

We used angle-resolved photoemission spectroscopy to investigate the electronic structure of EuFe $_{2}$ As $_{2}$ , EuFe $_{2}$ As $_{1.4}$ P $_{0.6}$ and EuFe $_{2}$ P $_{2}$ . We observed doubled core level peaks associated to the pnictide atoms, which are related to a surface state. Nevertheless, strong electronic dispersion along the $c$ axis, especially pronounced in EuFe $_{2}$ P $_{2}$ , is observed for at less one band, thus indicated that the Fe states, albeit probably affected at the surface, do not form pure two-dimensional surface states. However, this latter material shows reduced spectral weight near the Fermi level as compared to EuFe $_{2}$ As $_{2}$ and EuFe $_{2}$ As $_{1.4}$ P $_{0.6}$ . An anomalous jump is also found in the electronic states associated with the Eu $^{2 +}$ $f$ states in EuFe $_{2}$ P $_{2}$ .

RevTex. 6 pages, 5 figures

Angle-resolved photoemission spectroscopy observation of anomalous electronic states in EuFe2​As2−x​Px​

Abstract

Angle-resolved photoemission spectroscopy observation of anomalous electronic states in EuFe $_{2}$ As $_{2 - x}$ P $_{x}$