Mott transition controlled by lattice-orbital coupling in 3d -metal-doped double-layer ruthenates

J. Peng, M. Q. Gu, X. M. Gu, G. T. Zhou, X. Y. Gao, J. Y. Liu, W. F. Xu, G. Q. Liu, X. Ke, L. Zhang, H. Han, Z. Qu, D. W. Fu, H. L. Cai, F. M. Zhang, Z. Q. Mao, X. S. Wu

Research output: Contribution to journalArticle

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Abstract

We have investigated unusual phase transitions that were triggered by chemical doping in Ca3Ru2O7. Our experiments showed that doping with a few percent of Mn (>4%) can change the quasi-two-dimensional metallic state of Ca3Ru2O7 into a Mott insulating state with a G-type antiferromagnetic order, but this Mott state cannot be induced by Fe doping. By combining these results with first-principles calculations, we show that lattice-orbital coupling (LOC) plays an important role in the Mott transition. Interestingly, the transition temperature TMIT is found to be predetermined by a structural parameter denoted by c/ab at temperatures far above Néel temperature TN. This LOC-assisted Mott transition clearly contrasts with the band-filling picture. It is addressed that this type of Mott transition originates in the strong scattering centers formed by specific 3d dopants. The dopant-scattering picture is then applied to explain the puzzling doping effects that occur in other ruthenates and 3d oxides. Our findings will advance the general understanding of how the unusual properties of 4d correlated systems are governed by the complex interplay that occurs among the charge, spin, lattice, and orbital degrees of freedom.

Original languageEnglish (US)
Article number205105
JournalPhysical Review B
Volume96
Issue number20
DOIs
StatePublished - Nov 2 2017

Fingerprint

Metals
Doping (additives)
orbitals
metals
scattering
Scattering
degrees of freedom
transition temperature
Oxides
Superconducting transition temperature
temperature
oxides
Phase transitions
Temperature
Experiments

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Peng, J., Gu, M. Q., Gu, X. M., Zhou, G. T., Gao, X. Y., Liu, J. Y., ... Wu, X. S. (2017). Mott transition controlled by lattice-orbital coupling in 3d -metal-doped double-layer ruthenates. Physical Review B, 96(20), [205105]. https://doi.org/10.1103/PhysRevB.96.205105
Peng, J. ; Gu, M. Q. ; Gu, X. M. ; Zhou, G. T. ; Gao, X. Y. ; Liu, J. Y. ; Xu, W. F. ; Liu, G. Q. ; Ke, X. ; Zhang, L. ; Han, H. ; Qu, Z. ; Fu, D. W. ; Cai, H. L. ; Zhang, F. M. ; Mao, Z. Q. ; Wu, X. S. / Mott transition controlled by lattice-orbital coupling in 3d -metal-doped double-layer ruthenates. In: Physical Review B. 2017 ; Vol. 96, No. 20.
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title = "Mott transition controlled by lattice-orbital coupling in 3d -metal-doped double-layer ruthenates",
abstract = "We have investigated unusual phase transitions that were triggered by chemical doping in Ca3Ru2O7. Our experiments showed that doping with a few percent of Mn (>4{\%}) can change the quasi-two-dimensional metallic state of Ca3Ru2O7 into a Mott insulating state with a G-type antiferromagnetic order, but this Mott state cannot be induced by Fe doping. By combining these results with first-principles calculations, we show that lattice-orbital coupling (LOC) plays an important role in the Mott transition. Interestingly, the transition temperature TMIT is found to be predetermined by a structural parameter denoted by c/ab at temperatures far above N{\'e}el temperature TN. This LOC-assisted Mott transition clearly contrasts with the band-filling picture. It is addressed that this type of Mott transition originates in the strong scattering centers formed by specific 3d dopants. The dopant-scattering picture is then applied to explain the puzzling doping effects that occur in other ruthenates and 3d oxides. Our findings will advance the general understanding of how the unusual properties of 4d correlated systems are governed by the complex interplay that occurs among the charge, spin, lattice, and orbital degrees of freedom.",
author = "J. Peng and Gu, {M. Q.} and Gu, {X. M.} and Zhou, {G. T.} and Gao, {X. Y.} and Liu, {J. Y.} and Xu, {W. F.} and Liu, {G. Q.} and X. Ke and L. Zhang and H. Han and Z. Qu and Fu, {D. W.} and Cai, {H. L.} and Zhang, {F. M.} and Mao, {Z. Q.} and Wu, {X. S.}",
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Peng, J, Gu, MQ, Gu, XM, Zhou, GT, Gao, XY, Liu, JY, Xu, WF, Liu, GQ, Ke, X, Zhang, L, Han, H, Qu, Z, Fu, DW, Cai, HL, Zhang, FM, Mao, ZQ & Wu, XS 2017, 'Mott transition controlled by lattice-orbital coupling in 3d -metal-doped double-layer ruthenates', Physical Review B, vol. 96, no. 20, 205105. https://doi.org/10.1103/PhysRevB.96.205105

Mott transition controlled by lattice-orbital coupling in 3d -metal-doped double-layer ruthenates. / Peng, J.; Gu, M. Q.; Gu, X. M.; Zhou, G. T.; Gao, X. Y.; Liu, J. Y.; Xu, W. F.; Liu, G. Q.; Ke, X.; Zhang, L.; Han, H.; Qu, Z.; Fu, D. W.; Cai, H. L.; Zhang, F. M.; Mao, Z. Q.; Wu, X. S.

In: Physical Review B, Vol. 96, No. 20, 205105, 02.11.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mott transition controlled by lattice-orbital coupling in 3d -metal-doped double-layer ruthenates

AU - Peng, J.

AU - Gu, M. Q.

AU - Gu, X. M.

AU - Zhou, G. T.

AU - Gao, X. Y.

AU - Liu, J. Y.

AU - Xu, W. F.

AU - Liu, G. Q.

AU - Ke, X.

AU - Zhang, L.

AU - Han, H.

AU - Qu, Z.

AU - Fu, D. W.

AU - Cai, H. L.

AU - Zhang, F. M.

AU - Mao, Z. Q.

AU - Wu, X. S.

PY - 2017/11/2

Y1 - 2017/11/2

N2 - We have investigated unusual phase transitions that were triggered by chemical doping in Ca3Ru2O7. Our experiments showed that doping with a few percent of Mn (>4%) can change the quasi-two-dimensional metallic state of Ca3Ru2O7 into a Mott insulating state with a G-type antiferromagnetic order, but this Mott state cannot be induced by Fe doping. By combining these results with first-principles calculations, we show that lattice-orbital coupling (LOC) plays an important role in the Mott transition. Interestingly, the transition temperature TMIT is found to be predetermined by a structural parameter denoted by c/ab at temperatures far above Néel temperature TN. This LOC-assisted Mott transition clearly contrasts with the band-filling picture. It is addressed that this type of Mott transition originates in the strong scattering centers formed by specific 3d dopants. The dopant-scattering picture is then applied to explain the puzzling doping effects that occur in other ruthenates and 3d oxides. Our findings will advance the general understanding of how the unusual properties of 4d correlated systems are governed by the complex interplay that occurs among the charge, spin, lattice, and orbital degrees of freedom.

AB - We have investigated unusual phase transitions that were triggered by chemical doping in Ca3Ru2O7. Our experiments showed that doping with a few percent of Mn (>4%) can change the quasi-two-dimensional metallic state of Ca3Ru2O7 into a Mott insulating state with a G-type antiferromagnetic order, but this Mott state cannot be induced by Fe doping. By combining these results with first-principles calculations, we show that lattice-orbital coupling (LOC) plays an important role in the Mott transition. Interestingly, the transition temperature TMIT is found to be predetermined by a structural parameter denoted by c/ab at temperatures far above Néel temperature TN. This LOC-assisted Mott transition clearly contrasts with the band-filling picture. It is addressed that this type of Mott transition originates in the strong scattering centers formed by specific 3d dopants. The dopant-scattering picture is then applied to explain the puzzling doping effects that occur in other ruthenates and 3d oxides. Our findings will advance the general understanding of how the unusual properties of 4d correlated systems are governed by the complex interplay that occurs among the charge, spin, lattice, and orbital degrees of freedom.

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DO - 10.1103/PhysRevB.96.205105

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