Determination of temperature-dependent atomic displacements in the Ca10Ir4As8(Fe2As2)5 superconductor with a metallic spacer layer

E. Paris, B. Joseph, A. Iadecola, C. Marini, K. Kudo, D. Mitsuoka, M. Nohara, Takashi Mizokawa, N. L. Saini

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number094508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number9
DOIs
Publication statusPublished - 2014 Sep 12
Externally publishedYes

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spacers
Superconducting materials
x ray absorption
X rays
Temperature
fine structure
temperature
disorders
Electronic states
data structures
Orbits
Physics
tetrahedrons
interlayers
orbits
temperature dependence
physics
electronics
interactions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Determination of temperature-dependent atomic displacements in the Ca10Ir4As8(Fe2As2)5 superconductor with a metallic spacer layer. / Paris, E.; Joseph, B.; Iadecola, A.; Marini, C.; Kudo, K.; Mitsuoka, D.; Nohara, M.; Mizokawa, Takashi; Saini, N. L.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 90, No. 9, 094508, 12.09.2014.

Research output: Contribution to journalArticle

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AU - Joseph, B.

AU - Iadecola, A.

AU - Marini, C.

AU - Kudo, K.

AU - Mitsuoka, D.

AU - Nohara, M.

AU - Mizokawa, Takashi

AU - Saini, N. L.

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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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