Spectroscopic indications of polaronic behavior of the strong spin-orbit insulator Sr3Ir2O7

P. D.C. King; T. Takayama; A. Tamai; E. Rozbicki; S. Mc Keown Walker; M. Shi; L. Patthey; R. G. Moore; D. Lu; K. M. Shen; H. Takagi; F. Baumberger

doi:10.1103/PhysRevB.87.241106

Spectroscopic indications of polaronic behavior of the strong spin-orbit insulator Sr₃Ir₂O₇

P. D.C. King, T. Takayama, A. Tamai, E. Rozbicki, S. Mc Keown Walker, M. Shi, L. Patthey, R. G. Moore, D. Lu, K. M. Shen, H. Takagi, F. Baumberger

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Abstract

We investigate the bilayer Ruddlesden-Popper iridate Sr₃Ir ₂O₇ by temperature-dependent angle-resolved photoemission. At low temperatures, we find a fully gapped correlated insulator, characterized by a small charge gap and narrow bandwidths. The low-energy spectral features show a pronounced temperature-dependent broadening and non-quasiparticle-like Gaussian line shapes. Together, these spectral features provide experimental evidence for a polaronic ground state. We observe similar behavior for the single-layer cousin Sr₂IrO₄, indicating that strong electron-boson coupling dominates the low-energy excitations of this exotic family of 5d compounds.

Original language	English
Article number	241106
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	87
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.87.241106
State	Published - Jun 24 2013
Externally published	Yes

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King, P. D. C., Takayama, T., Tamai, A., Rozbicki, E., Walker, S. M. K., Shi, M., Patthey, L., Moore, R. G., Lu, D., Shen, K. M., Takagi, H., & Baumberger, F. (2013). Spectroscopic indications of polaronic behavior of the strong spin-orbit insulator Sr₃Ir₂O₇. Physical Review B - Condensed Matter and Materials Physics, 87(24), Article 241106. https://doi.org/10.1103/PhysRevB.87.241106

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title = "Spectroscopic indications of polaronic behavior of the strong spin-orbit insulator Sr3Ir2O7",

abstract = "We investigate the bilayer Ruddlesden-Popper iridate Sr3Ir 2O7 by temperature-dependent angle-resolved photoemission. At low temperatures, we find a fully gapped correlated insulator, characterized by a small charge gap and narrow bandwidths. The low-energy spectral features show a pronounced temperature-dependent broadening and non-quasiparticle-like Gaussian line shapes. Together, these spectral features provide experimental evidence for a polaronic ground state. We observe similar behavior for the single-layer cousin Sr2IrO4, indicating that strong electron-boson coupling dominates the low-energy excitations of this exotic family of 5d compounds.",

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doi = "10.1103/PhysRevB.87.241106",

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AU - King, P. D.C.

AU - Takayama, T.

AU - Tamai, A.

AU - Rozbicki, E.

AU - Walker, S. Mc Keown

AU - Shi, M.

AU - Patthey, L.

AU - Moore, R. G.

AU - Lu, D.

AU - Shen, K. M.

AU - Takagi, H.

AU - Baumberger, F.

PY - 2013/6/24

Y1 - 2013/6/24

N2 - We investigate the bilayer Ruddlesden-Popper iridate Sr3Ir 2O7 by temperature-dependent angle-resolved photoemission. At low temperatures, we find a fully gapped correlated insulator, characterized by a small charge gap and narrow bandwidths. The low-energy spectral features show a pronounced temperature-dependent broadening and non-quasiparticle-like Gaussian line shapes. Together, these spectral features provide experimental evidence for a polaronic ground state. We observe similar behavior for the single-layer cousin Sr2IrO4, indicating that strong electron-boson coupling dominates the low-energy excitations of this exotic family of 5d compounds.

AB - We investigate the bilayer Ruddlesden-Popper iridate Sr3Ir 2O7 by temperature-dependent angle-resolved photoemission. At low temperatures, we find a fully gapped correlated insulator, characterized by a small charge gap and narrow bandwidths. The low-energy spectral features show a pronounced temperature-dependent broadening and non-quasiparticle-like Gaussian line shapes. Together, these spectral features provide experimental evidence for a polaronic ground state. We observe similar behavior for the single-layer cousin Sr2IrO4, indicating that strong electron-boson coupling dominates the low-energy excitations of this exotic family of 5d compounds.

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JO - Physical Review B - Condensed Matter and Materials Physics

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Spectroscopic indications of polaronic behavior of the strong spin-orbit insulator Sr₃Ir₂O₇

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