Effects of Zn substitution on the electronic structure of BaFe${}_2$As${}_2$ revealed by angle-resolved photoemission spectroscopy

Abstract

In Fe-based superconductors, electron doping is often realized by the substitution of transition-metal atoms for Fe. In order to investigate how the electronic structure of the parent compound is influenced by Zn substitution, which supplies nominally four extra electrons per substituted atom but is expected to induce the strongest impurity potential among the transition-metal atoms, we have performed an angle-resolved photoemission spectroscopy measurements on Ba(Fe_{1-x}Zn_x)_2As_2 (Zn-122). In Zn-122, the temperature dependence of the resistivity shows a kink around T~135 K, indicating antiferromagnetic order below the Neel temperature of T_N ~ 135 K. In fact, folded Fermi surfaces (FSs) similar to those of the parent compound have been observed below T_N. The hole and electron FS volumes are, therefore, different from those expected from the rigid-band model. The results can be understood if all the extra electrons occupy the Zn 3d state ~10 eV below the Fermi level and do not participate in the formation of the FSs.

6 pages, 8 figures

References in corpus (6)

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• Unconventional electronic reconstruction in undoped (Ba,Sr)Fe${}_2$As${}_2$ across the spin density wave transition
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Cited by in corpus (6)

• Photoemission and X-ray Absorption Studies of the Diluted Magnetic Semiconductor Ba${}_{1-y}$K${}_y$(Zn${}_{1-x}$Mn${}_x$)${}_2$As${}_2$ Isostructural to Fe-based Superconductors
• Absence of Superconductivity in the "hole-doped" Fe pnictide Ba(Fe${}_{1-x}$Mn${}_x$)${}_2$As${}_2$: Photoemission and X-ray Absorption Spectroscopy Studies
• The anomaly Cu doping effects on LiFeAs superconductors
• Disorder effects in multiorbital $s_{\pm }$-wave superconductors: Implications for Zn-doped BaFe${}_2$As${}_2$ compounds
• Fermi surfaces and Phase Stability of Ba(Fe${}_{1-x}$M${}_x$)${}_2$As${}_2$ (M=Co, Ni, Cu, Zn)
• Effects of single- and multi-substituted Zn ions in doped-122 type iron-based superconductors