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

研究成果: Article

3 引用 (Scopus)

抜粋

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.

元の言語English
ページ(範囲)1343-1346
ページ数4
ジャーナルJournal of Superconductivity and Novel Magnetism
25
発行部数5
DOI
出版物ステータスPublished - 2012 7 1
外部発表Yes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    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, N. L. (2012). Orbital degeneracy, Jahn-Teller effect, and superconductivity in transition-metal chalcogenides. Journal of Superconductivity and Novel Magnetism, 25(5), 1343-1346. https://doi.org/10.1007/s10948-012-1626-x