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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

68 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 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 - 2012 Jul 24
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.86.014519

Cite this

@article{4bb6546a55ef420db3c11c2c8c0f141f,

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

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.",

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

year = "2012",

month = jul,

day = "24",

doi = "10.1103/PhysRevB.86.014519",

language = "English",

volume = "86",

journal = "Physical Review B-Condensed Matter",

issn = "0163-1829",

publisher = "American Institute of Physics Publising LLC",

number = "1",

}

TY - JOUR

T1 - Orbital degeneracy and Peierls instability in the triangular-lattice superconductor Ir 1-xPt xTe 2

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.

UR - http://www.scopus.com/inward/record.url?scp=84864447541&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84864447541&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.86.014519

DO - 10.1103/PhysRevB.86.014519

M3 - Article

AN - SCOPUS:84864447541

SN - 0163-1829

VL - 86

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

IS - 1

M1 - 014519

ER -

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

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this