TY - JOUR
T1 - Determination of temperature-dependent atomic displacements in the Ca10Ir4As8(Fe2As2)5 superconductor with a metallic spacer layer
AU - Paris, E.
AU - Joseph, B.
AU - Iadecola, A.
AU - Marini, C.
AU - Kudo, K.
AU - Mitsuoka, D.
AU - Nohara, M.
AU - Mizokawa, T.
AU - Saini, N. L.
N1 - Funding Information:
The authors thank Dipanjan Banerjee and Alessandro Longo of BM-26, ESRF, for the support during the XAFS run. The present work is a part of the bilateral agreement between the Sapienza University of Rome and the University of Tokyo. This work was partially supported by Grants-in-Aid from the Japan Society of the Promotion of Science (JSPS) (Grants No. 22540363, No. 25400372, No. 25400356, and No. 26287082) and the Funding Program for World-Leading Innovative R and D on Science and Technology (FIRST Program) from the JSPS. The work at Sapienza University of Rome is partially supported by PRIN2012 (Grant No. 2012X3YFZ2).
Funding Information:
The authors thank Dipanjan Banerjee and Alessandro Longo of BM-26, ESRF, for the support during the XAFS run. The present work is a part of the bilateral agreement between the Sapienza University of Rome and the University of Tokyo. This work was partially supported by Grants-in-Aid from the Japan Society of the Promotion of Science (JSPS) (Grants No. 22540363, No. 25400372, No. 25400356, and No. 26287082) and the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program) from the JSPS. The work at Sapienza University of Rome is partially supported by PRIN2012 (Grant No. 2012X3YFZ2).
Publisher Copyright:
© 2014 American Physical Society.
PY - 2014/9/12
Y1 - 2014/9/12
N2 - We have used the combination of Fe K-edge and Ir L3-edge x-ray absorption measurements as a function of temperature to investigate local atomic displacements in the newly discovered Ca10Ir4As8(Fe2As2)5 superconducting system. We find relatively relaxed Fe-Fe atomic pair correlations with large displacements in the FeAs4 tetrahedra, revealed by Fe K-edge extended x-ray absorption fine structure (EXAFS) analysis. Similarly, the temperature dependence of Ir L3-edge EXAFS shows nanoscale disorder in the IrAs layer that should have a significant effect on the active FeAs-layer characteristics. Furthermore, x-ray absorption near edge structure data are presented to discuss the evolution of the unoccupied electronic states revealing the marginal role of spin-orbit coupling, while the interlayer interactions and disorder should be important for describing the physics of the Ca10Ir4As8(Fe2As2)5 system.
AB - We have used the combination of Fe K-edge and Ir L3-edge x-ray absorption measurements as a function of temperature to investigate local atomic displacements in the newly discovered Ca10Ir4As8(Fe2As2)5 superconducting system. We find relatively relaxed Fe-Fe atomic pair correlations with large displacements in the FeAs4 tetrahedra, revealed by Fe K-edge extended x-ray absorption fine structure (EXAFS) analysis. Similarly, the temperature dependence of Ir L3-edge EXAFS shows nanoscale disorder in the IrAs layer that should have a significant effect on the active FeAs-layer characteristics. Furthermore, x-ray absorption near edge structure data are presented to discuss the evolution of the unoccupied electronic states revealing the marginal role of spin-orbit coupling, while the interlayer interactions and disorder should be important for describing the physics of the Ca10Ir4As8(Fe2As2)5 system.
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U2 - 10.1103/PhysRevB.90.094508
DO - 10.1103/PhysRevB.90.094508
M3 - Article
AN - SCOPUS:84984984303
SN - 1098-0121
VL - 90
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 9
M1 - 094508
ER -