Orbital degeneracy, Jahn-Teller effect, and superconductivity in transition-metal chalcogenides

Takashi Mizokawa, T. Sudayama, Y. Wakisaka, D. Ootsuki, M. Imaizumi, T. Noji, Y. Koike, S. Pyon, K. Kudo, M. Nohara, H. Anzai, M. Arita, H. Namatame, M. Taniguchi, N. L. Saini

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We have studied the electronic structure of FeSe1-xTex and Ir1-xPtxTe 2 using photoemission spectroscopy. For FeSe1-xTex , angle-resolved photoemission results indicate that the Fe 3d yz/zx orbital degeneracy at F point and orbitally induced Peierls effect in the tetragonal lattice play important roles for the superconductivity. It is suggested that the Jahn-Teller instability of the yz/zx states couples with local lattice distortion derived from the Te substitution for Se and provides an inhomogeneous electronic state. Photoemission results of IrTe 2 with triangular lattice are also consistent with the orbitally induced Peierls scenario. The Pt substitution for Ir suppresses the static band Jahn-Teller effect and induces an inhomogeneous electronic state in which orbital (or bond or nematic) fluctuations may help superconductivity through the Peierls effect.

Original languageEnglish
Pages (from-to)1343-1346
Number of pages4
JournalJournal of Superconductivity and Novel Magnetism
Volume25
Issue number5
DOIs
Publication statusPublished - 2012 Jul
Externally publishedYes

Fingerprint

Jahn-Teller effect
Chalcogenides
chalcogenides
Photoemission
Electronic states
Superconductivity
Transition metals
Substitution reactions
photoelectric emission
superconductivity
transition metals
orbitals
Photoelectron spectroscopy
substitutes
Electronic structure
electronics
electronic structure
spectroscopy

Keywords

  • (Ir,Pt)Te
  • ARPES
  • Fe(Se,Te)
  • Inhomogeneity
  • Orbitally induced Peierls transition

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Orbital degeneracy, Jahn-Teller effect, and superconductivity in transition-metal chalcogenides. / Mizokawa, Takashi; Sudayama, T.; Wakisaka, Y.; Ootsuki, D.; Imaizumi, M.; Noji, T.; Koike, Y.; Pyon, S.; Kudo, K.; Nohara, M.; Anzai, H.; Arita, M.; Namatame, H.; Taniguchi, M.; Saini, N. L.

In: Journal of Superconductivity and Novel Magnetism, Vol. 25, No. 5, 07.2012, p. 1343-1346.

Research output: Contribution to journalArticle

Mizokawa, T, Sudayama, T, Wakisaka, Y, Ootsuki, D, Imaizumi, M, Noji, T, Koike, Y, Pyon, S, Kudo, K, Nohara, M, Anzai, H, Arita, M, Namatame, H, Taniguchi, M & Saini, NL 2012, 'Orbital degeneracy, Jahn-Teller effect, and superconductivity in transition-metal chalcogenides', Journal of Superconductivity and Novel Magnetism, vol. 25, no. 5, pp. 1343-1346. https://doi.org/10.1007/s10948-012-1626-x
Mizokawa, Takashi ; Sudayama, T. ; Wakisaka, Y. ; Ootsuki, D. ; Imaizumi, M. ; Noji, T. ; Koike, Y. ; Pyon, S. ; Kudo, K. ; Nohara, M. ; Anzai, H. ; Arita, M. ; Namatame, H. ; Taniguchi, M. ; Saini, N. L. / Orbital degeneracy, Jahn-Teller effect, and superconductivity in transition-metal chalcogenides. In: Journal of Superconductivity and Novel Magnetism. 2012 ; Vol. 25, No. 5. pp. 1343-1346.
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