Interface-engineered hole doping in Sr2IrO4/LaNiO3 heterostructure

Wen, Fangdi; Liu, Xiaoran; Zhang, Qinghua; Kareev, M.; Pal, B.; Cao, Yanwei; Freeland, J. W.; N’Diaye, A. T.; Shafer, P.; Arenholz, E.; Gu, Lin; Chakhalian, J.

doi:10.1088/1367-2630/ab452c

Title: Interface-engineered hole doping in Sr₂IrO₄/LaNiO₃ heterostructure

Abstract

The relativistic Mott insulator Sr₂IrO₄ driven by large spin-orbit interaction is known for the J_eff = 1/2 antiferromagnetic state which closely resembles the electronic structure of parent compounds of superconducting cuprates. Here, we report the realization of hole-doped Sr₂IrO₄ by means of interfacial charge transfer in Sr₂IrO₄/LaNiO₃ heterostructures. X-ray photoelectron spectroscopy on Ir 4f edge along with the x-ray absorption spectroscopy at Ni L ₂ edge confirmed that 5d electrons from Ir sites are transferred onto Ni sites, leading to markedly electronic reconstruction at the interface. Although the Sr₂IrO₄/LaNiO₃ heterostructure remains non-metallic, we reveal that the transport behavior is no longer described by the Mott variable range hopping mode, but by the Efros-Shklovskii model. These findings highlight a powerful utility of interfaces to realize emerging electronic states of the Ruddlesden-Popper phases of Ir-based oxides.

Authors:

; Liu, Xiaoran; Zhang, Qinghua; Kareev, M.; Pal, B.; Cao, Yanwei; Freeland, J. W.; N’Diaye, A. T.; Shafer, P.; Arenholz, E.; Gu, Lin; Chakhalian, J.

Publication Date:: 2019-10-01

Research Org.:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation; Chinese Academy of Sciences (CAS); National Natural Science Foundation of China (NSFC)

OSTI Identifier:: 1569088

Alternate Identifier(s):: OSTI ID: 1599811; OSTI ID: 1609143

Grant/Contract Number:: AC02-05CH11231; GBMF4534; SC0012375; XDB07030200; 51522212; 51421002; 51672307; AC02-06CH11357

Resource Type:: Published Article

Journal Name:: New Journal of Physics

Additional Journal Information:: Journal Name: New Journal of Physics Journal Volume: 21 Journal Issue: 10; Journal ID: ISSN 1367-2630

Publisher:: IOP Publishing

Country of Publication:: United Kingdom

Language:: English

Subject:: 36 MATERIALS SCIENCE; complex oxide heterostructure; x-ray adsorption spectroscopy; layered-Iridates; x-ray absorption spectroscopy

Citation Formats


                    Wen, Fangdi, Liu, Xiaoran, Zhang, Qinghua, Kareev, M., Pal, B., Cao, Yanwei, Freeland, J. W., N’Diaye, A. T., Shafer, P., Arenholz, E., Gu, Lin, and Chakhalian, J. Interface-engineered hole doping in Sr2IrO4/LaNiO3 heterostructure.  United Kingdom: N. p., 2019. 
Web.  doi:10.1088/1367-2630/ab452c.

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                    Wen, Fangdi, Liu, Xiaoran, Zhang, Qinghua, Kareev, M., Pal, B., Cao, Yanwei, Freeland, J. W., N’Diaye, A. T., Shafer, P., Arenholz, E., Gu, Lin, & Chakhalian, J. Interface-engineered hole doping in Sr2IrO4/LaNiO3 heterostructure.  United Kingdom.  https://doi.org/10.1088/1367-2630/ab452c

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                    Wen, Fangdi, Liu, Xiaoran, Zhang, Qinghua, Kareev, M., Pal, B., Cao, Yanwei, Freeland, J. W., N’Diaye, A. T., Shafer, P., Arenholz, E., Gu, Lin, and Chakhalian, J. Tue .  
"Interface-engineered hole doping in Sr2IrO4/LaNiO3 heterostructure".  United Kingdom.  https://doi.org/10.1088/1367-2630/ab452c.

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@article{osti_1569088,

  title        = {Interface-engineered hole doping in Sr2IrO4/LaNiO3 heterostructure},

  author       = {Wen, Fangdi and Liu, Xiaoran and Zhang, Qinghua and Kareev, M. and Pal, B. and Cao, Yanwei and Freeland, J. W. and N’Diaye, A. T. and Shafer, P. and Arenholz, E. and Gu, Lin and Chakhalian, J.},

  abstractNote = {The relativistic Mott insulator Sr2IrO4 driven by large spin-orbit interaction is known for the Jeff = 1/2 antiferromagnetic state which closely resembles the electronic structure of parent compounds of superconducting cuprates. Here, we report the realization of hole-doped Sr2IrO4 by means of interfacial charge transfer in Sr2IrO4/LaNiO3 heterostructures. X-ray photoelectron spectroscopy on Ir 4f edge along with the x-ray absorption spectroscopy at Ni L 2 edge confirmed that 5d electrons from Ir sites are transferred onto Ni sites, leading to markedly electronic reconstruction at the interface. Although the Sr2IrO4/LaNiO3 heterostructure remains non-metallic, we reveal that the transport behavior is no longer described by the Mott variable range hopping mode, but by the Efros-Shklovskii model. These findings highlight a powerful utility of interfaces to realize emerging electronic states of the Ruddlesden-Popper phases of Ir-based oxides.},

  doi          = {10.1088/1367-2630/ab452c},

  journal      = {New Journal of Physics},

  number       = 10,

  volume       = 21,

  place        = {United Kingdom},

  year         = {2019},

  month        = {10}

}

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Title: Interface-engineered hole doping in Sr2IrO4/LaNiO3 heterostructure

Abstract

Citation Formats

Digital modulation of the nickel valence state in a cuprate-nickelate heterostructure journal, March 2018

Spin liquids in frustrated magnets journal, March 2010

Spin-Orbit Physics Giving Rise to Novel Phases in Correlated Systems: Iridates and Related Materials journal, March 2016

Odd-Parity Triplet Superconducting Phase in Multiorbital Materials with a Strong Spin-Orbit Coupling: Application to Doped Sr 2 IrO 4 journal, October 2014

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Novel J eff = 1 / 2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr 2 IrO 4 journal, August 2008

Correlated Quantum Phenomena in the Strong Spin-Orbit Regime journal, March 2014

Enhanced weak ferromagnetism and conductivity in hole-doped pyrochlore iridate Y 2 Ir 2 O 7 journal, August 2014

Nature of the metal-insulator transition in few-unit-cell-thick LaNiO3 films journal, June 2018

Evolution of structure, magnetism, and electronic transport in the doped pyrochlore iridate Y 2 Ir 2 − x Ru x O 7 journal, February 2017

Metal-insulator transitions journal, October 1998

Evidence of an odd-parity hidden order in a spin–orbit coupled correlated iridate journal, October 2015

Magnetic Excitation Spectra of Sr 2 IrO 4 Probed by Resonant Inelastic X-Ray Scattering: Establishing Links to Cuprate Superconductors journal, April 2012

Surface symmetry-breaking and strain effects on orbital occupancy in transition metal perovskite epitaxial films journal, January 2012

Hallmarks of the Mott-metal crossover in the hole-doped pseudospin-1/2 Mott insulator Sr2IrO4 journal, April 2016

Weak ferromagnetism, metal-to-nonmetal transition, and negative differential resistivity in single-crystal Sr 2 IrO 4 journal, May 1998

Conduction in non-crystalline materials: III. Localized states in a pseudogap and near extremities of conduction and valence bands journal, April 1969

Electron-doped Sr 2 IrO 4 − δ ( 0 ≤ δ ≤ 0.04 ) : Evolution of a disordered J eff = 1 2 Mott insulator into an exotic metallic state journal, September 2010

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Phase-Sensitive Observation of a Spin-Orbital Mott State in Sr2IrO4 journal, March 2009

Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly Doped Sr 2 IrO 4 journal, October 2015

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Giant magnetoelectric effect in the J eff = 1 2 Mott insulator Sr 2 IrO 4 journal, October 2009

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Tuning the Electronic Structure of Sr 2 IrO 4 Thin Films by Bulk Electronic Doping Using Molecular Beam Epitaxy journal, May 2015

Asymmetric Orbital-Lattice Interactions in Ultrathin Correlated Oxide Films journal, September 2011

Ambipolar transport and magneto-resistance crossover in a Mott insulator, Sr 2 IrO 4 journal, October 2016

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Title: Interface-engineered hole doping in Sr₂IrO₄/LaNiO₃ heterostructure

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Spin liquids in frustrated magnets
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Spin-Orbit Physics Giving Rise to Novel Phases in Correlated Systems: Iridates and Related Materials
journal, March 2016

Odd-Parity Triplet Superconducting Phase in Multiorbital Materials with a Strong Spin-Orbit Coupling: Application to Doped ${Sr}_{2} {IrO}_{4}$
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Novel $J_{eff} = 1 / 2$ Mott State Induced by Relativistic Spin-Orbit Coupling in ${Sr}_{2} {IrO}_{4}$
journal, August 2008

Correlated Quantum Phenomena in the Strong Spin-Orbit Regime
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Metal-insulator transitions
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Evidence of an odd-parity hidden order in a spin–orbit coupled correlated iridate
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Magnetic Excitation Spectra of ${Sr}_{2} {IrO}_{4}$ Probed by Resonant Inelastic X-Ray Scattering: Establishing Links to Cuprate Superconductors
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Surface symmetry-breaking and strain effects on orbital occupancy in transition metal perovskite epitaxial films
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Hallmarks of the Mott-metal crossover in the hole-doped pseudospin-1/2 Mott insulator Sr2IrO4
journal, April 2016

Weak ferromagnetism, metal-to-nonmetal transition, and negative differential resistivity in single-crystal ${Sr}_{2} {IrO}_{4}$
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Conduction in non-crystalline materials: III. Localized states in a pseudogap and near extremities of conduction and valence bands
journal, April 1969

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Coulomb gap and low temperature conductivity of disordered systems
journal, February 1975

Topological properties and functionalities in oxide thin films and interfaces
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Tuning the entanglement between orbital reconstruction and charge transfer at a film surface
journal, February 2014

Phase-Sensitive Observation of a Spin-Orbital Mott State in Sr2IrO4
journal, March 2009

Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly Doped ${Sr}_{2} {IrO}_{4}$
journal, October 2015

Electron-Doped ${Sr}_{2} {IrO}_{4}$ : An Analogue of Hole-Doped Cuprate Superconductors Demonstrated by Scanning Tunneling Microscopy
journal, November 2015

Giant magnetoelectric effect in the $J_{eff} = \frac{1}{2}$ Mott insulator ${Sr}_{2} {IrO}_{4}$
journal, October 2009

Twisted Hubbard Model for ${Sr}_{2} {IrO}_{4}$ : Magnetism and Possible High Temperature Superconductivity
journal, March 2011

Synthesis and electronic properties of Ruddlesden-Popper strontium iridate epitaxial thin films stabilized by control of growth kinetics
journal, December 2017

Observation of a d-wave gap in electron-doped Sr2IrO4
journal, October 2015

Tuning the Electronic Structure of Sr ₂ IrO ₄ Thin Films by Bulk Electronic Doping Using Molecular Beam Epitaxy
journal, May 2015

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Unidirectional spin density wave state in metallic (Sr1−xLax)2IrO4
journal, January 2018

Monte Carlo Study of an Unconventional Superconducting Phase in Iridium Oxide $J_{eff} = 1 / 2$ Mott Insulators Induced by Carrier Doping
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