Orbital degeneracy and Peierls instability in the triangular-lattice superconductor Ir 1-xPt xTe 2

Daiki Ootsuki, Yuki Wakisaka, Sunseng Pyon, Kazutaka Kudo, Minoru Nohara, Masashi Arita, Hiroaki Anzai, Hirofumi Namatame, Masaki Taniguchi, Naurang L. Saini, Takashi Mizokawa

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Abstract

We have studied the electronic structure of the triangular lattice Ir 1-xPt xTe 2 superconductor using photoemission spectroscopy and model calculations. Ir 4f core-level photoemission spectra show that Ir 5d t 2g charge modulation established in the low-temperature phase of IrTe 2 is suppressed by Pt doping. This observation indicates that the suppression of charge modulation is related to the emergence of superconductivity. Valence-band photoemission spectra of IrTe 2 suggest that the Ir 5d charge modulation is accompanied by Ir 5d orbital reconstruction. Based on the photoemission results and model calculations, we argue that the orbitally induced Peierls effect governs the charge and orbital instability in Ir 1-xPt xTe 2.

Original languageEnglish
Article number014519
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number1
DOIs
Publication statusPublished - 2012 Jul 24
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Ootsuki, D., Wakisaka, Y., Pyon, S., Kudo, K., Nohara, M., Arita, M., Anzai, H., Namatame, H., Taniguchi, M., Saini, N. L., & Mizokawa, T. (2012). Orbital degeneracy and Peierls instability in the triangular-lattice superconductor Ir 1-xPt xTe 2 Physical Review B - Condensed Matter and Materials Physics, 86(1), [014519]. https://doi.org/10.1103/PhysRevB.86.014519