title: Various Arsenic Network Structures in 112-Type Ca1-xLaxFe1-yPdyAs2Revealed by Synchrotron X-ray Diffraction Experiments.
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 Ca1-xLaxFeAs2with maximum Tc= 34 K, deformed arsenic network structures appeared in other 112-type materials, such as longitudinal arsenic zigzag chains in CaFe1-yPdyAs2(y ∼ 0.51) and arsenic square sheets constructed via hypervalent bonding in Ca1-xLaxFe1-yPdyAs2(x ∼ 0.31, y ∼ 0.30). As K-edge XANES spectra clarified the similar oxidization states around FeAs4tetrahedrons, alluding to possible parents for high-Tc112-type iron arsenide superconductors.
authors.affiliation: Department of Applied Physics, Nagoya University , Nagoya 464-8603, Japan.
authors.forename: Shinya
authors.initials: S
authors.lastname: Tamura
authors.affiliation: Department of Applied Physics, Nagoya University , Nagoya 464-8603, Japan.
authors.forename: Naoyuki
authors.identifier: http://orcid.org/0000-0002-9456-2201
authors.initials: N
authors.lastname: Katayama
authors.affiliation: Department of Applied Physics, Nagoya University , Nagoya 464-8603, Japan.
authors.forename: Yuto
authors.initials: Y
authors.lastname: Yamada
authors.affiliation: Department of Applied Physics, Nagoya University , Nagoya 464-8603, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Sugiyama
authors.affiliation: Department of Applied Physics, Nagoya University , Nagoya 464-8603, Japan.
authors.forename: Kento
authors.initials: K
authors.lastname: Sugawara
authors.affiliation: Department of Applied Physics, Nagoya University , Nagoya 464-8603, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sawa