Various Arsenic Network Structures in 112-Type Ca1-xLaxFe1-yPdyAs2 Revealed by Synchrotron X-ray Diffraction Experiments

Shinya Tamura; Naoyuki Katayama; Yuto Yamada; Yuki Sugiyama; Kento Sugawara; Hiroshi Sawa

doi:10.1021/acs.inorgchem.6b03115

Various Arsenic Network Structures in 112-Type Ca_1-xLa_xFe_1-yPd_yAs₂ Revealed by Synchrotron X-ray Diffraction Experiments

Inorg Chem. 2017 Mar 6;56(5):3030-3035. doi: 10.1021/acs.inorgchem.6b03115. Epub 2017 Feb 13.

Authors

Shinya Tamura¹, Naoyuki Katayama¹, Yuto Yamada¹, Yuki Sugiyama¹, Kento Sugawara¹, Hiroshi Sawa¹

Affiliation

¹ Department of Applied Physics, Nagoya University , Nagoya 464-8603, Japan.

PMID: 28191970
DOI: 10.1021/acs.inorgchem.6b03115

Abstract

Two novel 112-type palladium-doped iron arsenides were synthesized and identified using comprehensive studies involving synchrotron X-ray diffraction and X-ray absorption near-edge structure (XANES) experiments. Whereas in-plane arsenic zigzag chains were found in the 112-type superconducting iron arsenide Ca_1-xLa_xFeAs₂ with maximum T_c = 34 K, deformed arsenic network structures appeared in other 112-type materials, such as longitudinal arsenic zigzag chains in CaFe_1-yPd_yAs₂ (y ∼ 0.51) and arsenic square sheets constructed via hypervalent bonding in Ca_1-xLa_xFe_1-yPd_yAs₂ (x ∼ 0.31, y ∼ 0.30). As K-edge XANES spectra clarified the similar oxidization states around FeAs₄ tetrahedrons, alluding to possible parents for high-T_c 112-type iron arsenide superconductors.