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

T. 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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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
Issue number5
Publication statusPublished - 2012 Jul
Externally publishedYes


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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


Dive into the research topics of 'Orbital degeneracy, Jahn-Teller effect, and superconductivity in transition-metal chalcogenides'. Together they form a unique fingerprint.

Cite this