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

Research output: Contribution to journalArticle

59 Citations (Scopus)

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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Photoemission
Superconducting materials
photoelectric emission
Modulation
orbitals
modulation
Core levels
Photoelectron spectroscopy
Valence bands
Superconductivity
Electronic structure
Doping (additives)
superconductivity
retarding
electronic structure
valence
spectroscopy
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Orbital degeneracy and Peierls instability in the triangular-lattice superconductor Ir 1-xPt xTe 2 . / Ootsuki, Daiki; Wakisaka, Yuki; Pyon, Sunseng; Kudo, Kazutaka; Nohara, Minoru; Arita, Masashi; Anzai, Hiroaki; Namatame, Hirofumi; Taniguchi, Masaki; Saini, Naurang L.; Mizokawa, Takashi.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 86, No. 1, 014519, 24.07.2012.

Research output: Contribution to journalArticle

Ootsuki, D, Wakisaka, Y, Pyon, S, Kudo, K, Nohara, M, Arita, M, Anzai, H, Namatame, H, Taniguchi, M, Saini, NL & 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, vol. 86, no. 1, 014519. https://doi.org/10.1103/PhysRevB.86.014519
Ootsuki, Daiki ; Wakisaka, Yuki ; Pyon, Sunseng ; Kudo, Kazutaka ; Nohara, Minoru ; Arita, Masashi ; Anzai, Hiroaki ; Namatame, Hirofumi ; Taniguchi, Masaki ; Saini, Naurang L. ; Mizokawa, Takashi. / Orbital degeneracy and Peierls instability in the triangular-lattice superconductor Ir 1-xPt xTe 2 In: Physical Review B - Condensed Matter and Materials Physics. 2012 ; Vol. 86, No. 1.
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AU - Nohara, Minoru

AU - Arita, Masashi

AU - Anzai, Hiroaki

AU - Namatame, Hirofumi

AU - Taniguchi, Masaki

AU - Saini, Naurang L.

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