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

doi:10.1103/PhysRevB.86.014519

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 language	English
Article number	014519
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.86.014519
Publication status	Published - Jul 24 2012

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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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), Article 014519. https://doi.org/10.1103/PhysRevB.86.014519

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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.",

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AU - Ootsuki, Daiki

AU - Wakisaka, Yuki

AU - Pyon, Sunseng

AU - Kudo, Kazutaka

AU - Nohara, Minoru

AU - Arita, Masashi

AU - Anzai, Hiroaki

AU - Namatame, Hirofumi

AU - Taniguchi, Masaki

AU - Saini, Naurang L.

AU - Mizokawa, Takashi

PY - 2012/7/24

Y1 - 2012/7/24

N2 - 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.

AB - 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.

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Orbital degeneracy and Peierls instability in the triangular-lattice superconductor Ir _1-xPt _xTe ₂

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