Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 450-461 |
| Number of pages | 12 |
| Journal | Advances in Physics: X |
| Volume | 2 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Mar 4 2017 |
Fingerprint
Keywords
- 74.10.+v Occurrence, potential candidates
- 74.25.Dw Superconductivity phase diagrams
- 74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
- 74.70.Xa Pnictides and chalcogenides
- Iron-based superconductors
- lattice collapse transitions
- layered structures
- pnictides
- valence transitions
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Arsenic chemistry of iron-based superconductors and strategy for novel superconducting materials. / Nohara, Minoru; Kudo, Kazutaka.
In: Advances in Physics: X, Vol. 2, No. 2, 04.03.2017, p. 450-461.Research output: Contribution to journal › Review article
}
TY - JOUR
T1 - Arsenic chemistry of iron-based superconductors and strategy for novel superconducting materials
AU - Nohara, Minoru
AU - Kudo, Kazutaka
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
UR - http://www.scopus.com/inward/record.url?scp=85036537412&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85036537412&partnerID=8YFLogxK
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 -