Temperature dependent nanoscale atomic correlations in Ir 1-xPtxTe2 (x=0.0, 0.03 and 0.04) system

B. Joseph, E. Paris, D. F. Mulato-Gómez, L. Simonelli, M. Bendele, L. Maugeri, A. Iadecola, S. Pyon, K. Kudo, M. Nohara, J. Mustre De Leon, T. Mizokawa, N. L. Saini

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Abstract

X-ray absorption near-edge structure (XANES) spectroscopy has been used to investigate the unoccupied electronic states and local geometry of Ir 1-xPtxTe2(x=0.0, 0.03 and 0.04) as a function of temperature. The Ir L3-edge absorption white line, as well as high energy XANES features due to the photoelectron multiple scatterings with near neighbours, reveal clear changes in the unoccupied 5d-electronic states and the local geometry with Pt substitution. We find an anomalous spectral weight transfer across the known first-order structural phase transition from the trigonal to monoclinic phase in IrTe2, which characterizes the reduced atomic structure symmetry below the transition temperature. No such changes with temperature are seen in the Pt substituted superconducting samples. In addition, a gradual increase of the spectral weight transfer is observed in IrTe2 with a further decrease in temperature below the transition, indicating that the low temperature phase is likely to have a symmetry lower than the monoclinic one. The results suggest that the interplay between inter-layer and intra-layer atomic correlations should have a significant role in the properties of an Ir1-xPtxTe2 system.

Original languageEnglish
Article number375702
JournalJournal of Physics Condensed Matter
Volume26
Issue number37
DOIs
Publication statusPublished - 2014 Sep 17

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Keywords

  • inter and intra-layer atomic correlations
  • layered superconductors
  • local structure
  • structural phase transition

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Joseph, B., Paris, E., Mulato-Gómez, D. F., Simonelli, L., Bendele, M., Maugeri, L., Iadecola, A., Pyon, S., Kudo, K., Nohara, M., Mustre De Leon, J., Mizokawa, T., & Saini, N. L. (2014). Temperature dependent nanoscale atomic correlations in Ir 1-xPtxTe2 (x=0.0, 0.03 and 0.04) system. Journal of Physics Condensed Matter, 26(37), [375702]. https://doi.org/10.1088/0953-8984/26/37/375702