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

doi:10.1007/s10948-012-1626-x

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

Graduate School of Natural Science and Technology

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

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 language	English
Pages (from-to)	1343-1346
Number of pages	4
Journal	Journal of Superconductivity and Novel Magnetism
Volume	25
Issue number	5
DOIs	https://doi.org/10.1007/s10948-012-1626-x
Publication status	Published - Jul 2012

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

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10.1007/s10948-012-1626-x

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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

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

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

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.",

keywords = "(Ir,Pt)Te, ARPES, Fe(Se,Te), Inhomogeneity, Orbitally induced Peierls transition",

author = "T. Mizokawa and T. Sudayama and Y. Wakisaka and D. Ootsuki and M. Imaizumi and T. Noji and Y. Koike and S. Pyon and K. Kudo and M. Nohara and H. Anzai and M. Arita and H. Namatame and M. Taniguchi and Saini, {N. L.}",

note = "Funding Information: Acknowledgements The authors would like to thank Prof. D.I. Khomskii for valuable discussions. The synchrotron radiation experiments have been done with the approval of Hiroshima Synchrotron Radiation Center (Proposal No. 10-A-10). This work was supported in part by the Global COE Program “the Physical Sciences Frontier”, MEXT, Japan.",

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doi = "10.1007/s10948-012-1626-x",

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T1 - Orbital degeneracy, Jahn-Teller effect, and superconductivity in transition-metal chalcogenides

AU - Mizokawa, T.

AU - Sudayama, T.

AU - Wakisaka, Y.

AU - Ootsuki, D.

AU - Imaizumi, M.

AU - Noji, T.

AU - Koike, Y.

AU - Pyon, S.

AU - Kudo, K.

AU - Nohara, M.

AU - Anzai, H.

AU - Arita, M.

AU - Namatame, H.

AU - Taniguchi, M.

AU - Saini, N. L.

N1 - Funding Information: Acknowledgements The authors would like to thank Prof. D.I. Khomskii for valuable discussions. The synchrotron radiation experiments have been done with the approval of Hiroshima Synchrotron Radiation Center (Proposal No. 10-A-10). This work was supported in part by the Global COE Program “the Physical Sciences Frontier”, MEXT, Japan.

PY - 2012/7

Y1 - 2012/7

N2 - 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.

AB - 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.

KW - (Ir,Pt)Te

KW - ARPES

KW - Fe(Se,Te)

KW - Inhomogeneity

KW - Orbitally induced Peierls transition

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

Abstract

Keywords

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