Electron doped Sr2IrO4- (0 0.04): Evolution of a disordered Jeff 1/2 Mott insulator into an exotic metallic state

T. F. Qi; O. B. Korneta; S. Chikara; M. Ge; S. Parkin; L. E. De Long; P. Schlottmann; G. Cao

doi:10.1063/1.3545803

Electron doped Sr₂IrO_4- (0 0.04): Evolution of a disordered J_eff 1/2 Mott insulator into an exotic metallic state

T. F. Qi, O. B. Korneta, S. Chikara, M. Ge, S. Parkin, L. E. De Long, P. Schlottmann, G. Cao

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

21 Scopus citations

Abstract

Stoichiometric Sr₂IrO₄ is a ferromagnetic J _eff 1/2 Mott insulator driven by strong spin-orbit coupling. Introduction of very dilute oxygen vacancies into single-crystal Sr ₂IrO_4- with δ≤0.04 leads to significant changes in lattice parameters and an insulator-to-metal transition at T_MI 105 K. The highly anisotropic electrical resistivity of the low-temperature metallic state for δ ≈ 0.04 exhibits anomalous properties characterized by non-Ohmic behavior and an abrupt current-induced transition in the resistivity at T*=52 K, which separates two regimes of resistive switching in the nonlinear I-V characteristics. The novel behavior illustrates an exotic ground state and constitutes a new paradigm for devices structures in which electrical resistivity is manipulated via low-level current densities ∼ 10 mA/cm² (compared to higher spin-torque currents ∼ 10 ⁷-10⁸ A/cm²) or magnetic inductions ∼ 0.1-1.0 T.

Original language	English
Article number	07D906
Journal	Journal of Applied Physics
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.3545803
State	Published - Apr 1 2011

Bibliographical note

Funding Information:
G. C. is thankful to Dr. M. Whangbo and Dr. J. W. Brill for useful discussions. This work was supported by the NSF through Grants Nos. DMR-0552267, DMR-0856234, and EPS-0814194 (G.C.), and by DOE through Grants Nos. DE-FG02-97ER45653 (L.E.D.) and DE-FG02-98ER45707 (P.S.).

Funding

G. C. is thankful to Dr. M. Whangbo and Dr. J. W. Brill for useful discussions. This work was supported by the NSF through Grants Nos. DMR-0552267, DMR-0856234, and EPS-0814194 (G.C.), and by DOE through Grants Nos. DE-FG02-97ER45653 (L.E.D.) and DE-FG02-98ER45707 (P.S.).

Funders	Funder number
National Science Foundation (NSF)	DMR-0856234, DMR-0552267, EPS-0814194
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research Laboratory	DE-FG02-97ER45653, DE-FG02-98ER45707

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1063/1.3545803

Cite this

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title = "Electron doped Sr2IrO4- (0 0.04): Evolution of a disordered Jeff 1/2 Mott insulator into an exotic metallic state",

abstract = "Stoichiometric Sr2IrO4 is a ferromagnetic J eff 1/2 Mott insulator driven by strong spin-orbit coupling. Introduction of very dilute oxygen vacancies into single-crystal Sr 2IrO4- with δ≤0.04 leads to significant changes in lattice parameters and an insulator-to-metal transition at TMI 105 K. The highly anisotropic electrical resistivity of the low-temperature metallic state for δ ≈ 0.04 exhibits anomalous properties characterized by non-Ohmic behavior and an abrupt current-induced transition in the resistivity at T*=52 K, which separates two regimes of resistive switching in the nonlinear I-V characteristics. The novel behavior illustrates an exotic ground state and constitutes a new paradigm for devices structures in which electrical resistivity is manipulated via low-level current densities ∼ 10 mA/cm2 (compared to higher spin-torque currents ∼ 10 7-108 A/cm2) or magnetic inductions ∼ 0.1-1.0 T.",

author = "Qi, {T. F.} and Korneta, {O. B.} and S. Chikara and M. Ge and S. Parkin and {De Long}, {L. E.} and P. Schlottmann and G. Cao",

note = "Funding Information: G. C. is thankful to Dr. M. Whangbo and Dr. J. W. Brill for useful discussions. This work was supported by the NSF through Grants Nos. DMR-0552267, DMR-0856234, and EPS-0814194 (G.C.), and by DOE through Grants Nos. DE-FG02-97ER45653 (L.E.D.) and DE-FG02-98ER45707 (P.S.).",

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AU - Qi, T. F.

AU - Korneta, O. B.

AU - Chikara, S.

AU - Ge, M.

AU - Parkin, S.

AU - De Long, L. E.

AU - Schlottmann, P.

AU - Cao, G.

N1 - Funding Information: G. C. is thankful to Dr. M. Whangbo and Dr. J. W. Brill for useful discussions. This work was supported by the NSF through Grants Nos. DMR-0552267, DMR-0856234, and EPS-0814194 (G.C.), and by DOE through Grants Nos. DE-FG02-97ER45653 (L.E.D.) and DE-FG02-98ER45707 (P.S.).

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Y1 - 2011/4/1

N2 - Stoichiometric Sr2IrO4 is a ferromagnetic J eff 1/2 Mott insulator driven by strong spin-orbit coupling. Introduction of very dilute oxygen vacancies into single-crystal Sr 2IrO4- with δ≤0.04 leads to significant changes in lattice parameters and an insulator-to-metal transition at TMI 105 K. The highly anisotropic electrical resistivity of the low-temperature metallic state for δ ≈ 0.04 exhibits anomalous properties characterized by non-Ohmic behavior and an abrupt current-induced transition in the resistivity at T*=52 K, which separates two regimes of resistive switching in the nonlinear I-V characteristics. The novel behavior illustrates an exotic ground state and constitutes a new paradigm for devices structures in which electrical resistivity is manipulated via low-level current densities ∼ 10 mA/cm2 (compared to higher spin-torque currents ∼ 10 7-108 A/cm2) or magnetic inductions ∼ 0.1-1.0 T.

AB - Stoichiometric Sr2IrO4 is a ferromagnetic J eff 1/2 Mott insulator driven by strong spin-orbit coupling. Introduction of very dilute oxygen vacancies into single-crystal Sr 2IrO4- with δ≤0.04 leads to significant changes in lattice parameters and an insulator-to-metal transition at TMI 105 K. The highly anisotropic electrical resistivity of the low-temperature metallic state for δ ≈ 0.04 exhibits anomalous properties characterized by non-Ohmic behavior and an abrupt current-induced transition in the resistivity at T*=52 K, which separates two regimes of resistive switching in the nonlinear I-V characteristics. The novel behavior illustrates an exotic ground state and constitutes a new paradigm for devices structures in which electrical resistivity is manipulated via low-level current densities ∼ 10 mA/cm2 (compared to higher spin-torque currents ∼ 10 7-108 A/cm2) or magnetic inductions ∼ 0.1-1.0 T.

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