TY - JOUR
T1 - Arsenic chemistry of iron-based superconductors and strategy for novel superconducting materials
AU - Nohara, Minoru
AU - Kudo, Kazutaka
N1 - Funding Information:
This work was supported by the Japan Society for the Promotion of Science (JPSJ) through Grants-in-Aid for Scientific Research [grant number 26287082], [grant number 15H01047], [grant number 15H05886], [grant number 16K05451]; the Program for Advancing Strategic International Networks to Accelerate the Circulation of Talented Researchers from JSPS.
Publisher Copyright:
© 2017, © 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2017/3/4
Y1 - 2017/3/4
N2 - The progress of materials discovery of iron-based superconductors is reviewed with the emphasis on the valence states and chemical bonds of arsenic. We demonstrate that monovalent As– produces the 112-type CaFeAs2 with arsenic zigzag chains. When co-doping of La and Sb is performed, the superconducting transition temperature rises to 47 K. In the 10-4-8-type Ca10(Pt4As8)(Fe2−xPtxAs2)5, the divalent As2– produces As2 molecules, and creates an interlayer substance with PtAs4 planar squares. The maximum superconducting transition temperature is 38 K. In the 122-type CaFe2As2, Rh doping induces a lattice collapse transition accompanying the formation of As2 molecules between the adjacent FeAs layers. This transition can be viewed as a valence transition between As3– and As2–. These properties of arsenic that produces various chemical bonds can be used to create new superconducting materials.
AB - The progress of materials discovery of iron-based superconductors is reviewed with the emphasis on the valence states and chemical bonds of arsenic. We demonstrate that monovalent As– produces the 112-type CaFeAs2 with arsenic zigzag chains. When co-doping of La and Sb is performed, the superconducting transition temperature rises to 47 K. In the 10-4-8-type Ca10(Pt4As8)(Fe2−xPtxAs2)5, the divalent As2– produces As2 molecules, and creates an interlayer substance with PtAs4 planar squares. The maximum superconducting transition temperature is 38 K. In the 122-type CaFe2As2, Rh doping induces a lattice collapse transition accompanying the formation of As2 molecules between the adjacent FeAs layers. This transition can be viewed as a valence transition between As3– and As2–. These properties of arsenic that produces various chemical bonds can be used to create new superconducting materials.
KW - 74.10.+v Occurrence, potential candidates
KW - 74.25.Dw Superconductivity phase diagrams
KW - 74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
KW - 74.70.Xa Pnictides and chalcogenides
KW - Iron-based superconductors
KW - lattice collapse transitions
KW - layered structures
KW - pnictides
KW - valence transitions
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U2 - 10.1080/23746149.2017.1317024
DO - 10.1080/23746149.2017.1317024
M3 - Review article
AN - SCOPUS:85036537412
VL - 2
SP - 450
EP - 461
JO - Advances in Physics: X
JF - Advances in Physics: X
SN - 2374-6149
IS - 2
ER -