Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba)

Zhao, H. D.; Terzic, Jasminka; Zheng, Hao; Ni, Y. F.; Zhang, Y.; Ye, Feng; Schlottmann, P.; Cao, Gang

doi:10.1088/1361-648X/aac23d

Title: Decoupling of magnetism and electric transport in single-crystal (Sr_1–xA_x)₂IrO₄ (A = Ca or Ba)

Abstract

Here, we report a systematical structural, transport and magnetic study of Ca or Ba doped Sr₂IrO₄ single crystals. Isoelectronically substituting Ca²⁺ (up to 15%) or Ba²⁺ (up to 4%) ion for the Sr²⁺ ion provides no additional charge carriers but effectively changes the lattice parameters in Sr₂IrO₄. In particular, 15% Ca doping considerably reduces the c-axis and the unit cell by nearly 0.45% and 1.00%, respectively. These significant, anisotropic compressions in the lattice parameters conspicuously cause no change in the Néel temperature which remains at 240 K, but drastically reduces the electrical resistivity by up to five orders of magnitude or even precipitates a sharp insulator-to-metal transition at lower temperatures, i.e. the vanishing insulating state accompanies an unchanged Néel temperature in (Sr_1–xA_x)₂IrO₄. This observation brings to light an intriguing difference between chemical pressure and applied pressure, the latter of which does suppress the long-range magnetic order in Sr₂IrO₄. This difference reveals the importance of the Ir1–O2–Ir1 bond angle and homogenous volume compression in determining the magnetic ground state. All results, along with a comparison drawn with results of Tb and La doped Sr₂IrO₄, underscore that the magnetic transition plays a nonessential role in the formation of the charge gap inmore » the spin–orbit-tuned iridate.« less

Authors:

Zhao, H. D. ^[1]; Terzic, Jasminka ^[2]; Zheng, Hao ^[1]; Ni, Y. F. ^[1]; Zhang, Y. ^[1];

^[3]; Schlottmann, P. ^[4];

^[1]

Univ. of Colorado, Boulder, CO (United States)
Univ. of Colorado, Boulder, CO (United States); National High Magnetic Field Lab., Tallahassee, FL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Florida State Univ., Tallahassee, FL (United States)

Publication Date:: Mon May 21 00:00:00 EDT 2018

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1465028

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physics. Condensed Matter

Additional Journal Information:: Journal Volume: 30; Journal Issue: 24; Journal ID: ISSN 0953-8984

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; spin–orbit coupling; iridates; magnetism; chemical doping

Citation Formats


                    Zhao, H. D., Terzic, Jasminka, Zheng, Hao, Ni, Y. F., Zhang, Y., Ye, Feng, Schlottmann, P., and Cao, Gang. Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba).  United States: N. p., 2018. 
Web.  doi:10.1088/1361-648X/aac23d.

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                    Zhao, H. D., Terzic, Jasminka, Zheng, Hao, Ni, Y. F., Zhang, Y., Ye, Feng, Schlottmann, P., & Cao, Gang. Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba).  United States.  https://doi.org/10.1088/1361-648X/aac23d

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                    Zhao, H. D., Terzic, Jasminka, Zheng, Hao, Ni, Y. F., Zhang, Y., Ye, Feng, Schlottmann, P., and Cao, Gang. Mon .  
"Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba)".  United States.  https://doi.org/10.1088/1361-648X/aac23d.  https://www.osti.gov/servlets/purl/1465028.

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@article{osti_1465028,

  title        = {Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba)},

  author       = {Zhao, H. D. and Terzic, Jasminka and Zheng, Hao and Ni, Y. F. and Zhang, Y. and Ye, Feng and Schlottmann, P. and Cao, Gang},

  abstractNote = {Here, we report a systematical structural, transport and magnetic study of Ca or Ba doped Sr2IrO4 single crystals. Isoelectronically substituting Ca2+ (up to 15%) or Ba2+ (up to 4%) ion for the Sr2+ ion provides no additional charge carriers but effectively changes the lattice parameters in Sr2IrO4. In particular, 15% Ca doping considerably reduces the c-axis and the unit cell by nearly 0.45% and 1.00%, respectively. These significant, anisotropic compressions in the lattice parameters conspicuously cause no change in the Néel temperature which remains at 240 K, but drastically reduces the electrical resistivity by up to five orders of magnitude or even precipitates a sharp insulator-to-metal transition at lower temperatures, i.e. the vanishing insulating state accompanies an unchanged Néel temperature in (Sr1–xAx)2IrO4. This observation brings to light an intriguing difference between chemical pressure and applied pressure, the latter of which does suppress the long-range magnetic order in Sr2IrO4. This difference reveals the importance of the Ir1–O2–Ir1 bond angle and homogenous volume compression in determining the magnetic ground state. All results, along with a comparison drawn with results of Tb and La doped Sr2IrO4, underscore that the magnetic transition plays a nonessential role in the formation of the charge gap in the spin–orbit-tuned iridate.},

  doi          = {10.1088/1361-648X/aac23d},

  journal      = {Journal of Physics. Condensed Matter},

  number       = 24,

  volume       = 30,

  place        = {United States},

  year         = {Mon May 21 00:00:00 EDT 2018},

  month        = {Mon May 21 00:00:00 EDT 2018}

}

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Journal Article:

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https://doi.org/10.1088/1361-648X/aac23d

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Cited by: 6 works

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Figures / Tables:

Fig. 1: (a) The crystal structure of Sr₂IrO₄. Note that the lower panel illustrates the rotation of IrO₆ octahedra about the $c$-axis for Sr₂IrO₄. (b) Representative single crystals of Ca doped Sr₂IrO₄.

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Works referenced in this record:

Atomically resolved spectroscopic study of Sr2IrO4: Experiment and theory
journal, October 2013

Li, Qing; Cao, Guixin; Okamoto, Satoshi
Scientific Reports, Vol. 3, Issue 1
DOI: 10.1038/srep03073

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

Zhao, L.; Torchinsky, D. H.; Chu, H.
Nature Physics, Vol. 12, Issue 1
DOI: 10.1038/nphys3517

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

Cao, Yue; Wang, Qiang; Waugh, Justin A.
Nature Communications, Vol. 7, Issue 1
DOI: 10.1038/ncomms11367

Neutron Powder Diffraction Study of the Crystal Structures of Sr2RuO4 and Sr2IrO4 at Room Temperature and at 10 K
journal, October 1994

Huang, Q.; Soubeyroux, J. L.; Chmaissem, O.
Journal of Solid State Chemistry, Vol. 112, Issue 2
DOI: 10.1006/jssc.1994.1316

Persistent non-metallic behavior in Sr ₂ IrO ₄ and Sr ₃ Ir ₂ O ₇ at high pressures
journal, June 2014

Zocco, D. A.; Hamlin, J. J.; White, B. D.
Journal of Physics: Condensed Matter, Vol. 26, Issue 25
DOI: 10.1088/0953-8984/26/25/255603

Novel $J_{eff} = 1 / 2$ Mott State Induced by Relativistic Spin-Orbit Coupling in ${Sr}_{2} {IrO}_{4}$
journal, August 2008

Kim, B. J.; Jin, Hosub; Moon, S. J.
Physical Review Letters, Vol. 101, Issue 7
DOI: 10.1103/PhysRevLett.101.076402

Localized-to-itinerant electron transition in ${Sr}_{2}$ ${Ir}_{1 - x}$ ${Ru}_{x}$ $O_{4}$
journal, May 1994

Cava, R. J.; Batlogg, B.; Kiyono, K.
Physical Review B, Vol. 49, Issue 17
DOI: 10.1103/PhysRevB.49.11890

Structural and magnetic studies of ${Sr}_{2}$ ${IrO}_{4}$
journal, April 1994

Crawford, M. K.; Subramanian, M. A.; Harlow, R. L.
Physical Review B, Vol. 49, Issue 13
DOI: 10.1103/PhysRevB.49.9198

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

Cao, G.; Bolivar, J.; McCall, S.
Physical Review B, Vol. 57, Issue 18
DOI: 10.1103/PhysRevB.57.R11039

Dimensionality-controlled Mott transition and correlation effects in single-layer and bilayer perovskite iridates
journal, June 2013

Wang, Q.; Cao, Y.; Waugh, J. A.
Physical Review B, Vol. 87, Issue 24
DOI: 10.1103/PhysRevB.87.245109

Two-Dimensional Heisenberg Behavior of $J_{eff} = 1 / 2$ Isospins in the Paramagnetic State of the Spin-Orbital Mott Insulator ${Sr}_{2} {IrO}_{4}$
journal, June 2012

Fujiyama, S.; Ohsumi, H.; Komesu, T.
Physical Review Letters, Vol. 108, Issue 24
DOI: 10.1103/PhysRevLett.108.247212

Local density of states study of a spin-orbit-coupling induced Mott insulator ${Sr}_{2} Ir O_{4}$
journal, July 2014

Dai, Jixia; Calleja, Eduardo; Cao, Gang
Physical Review B, Vol. 90, Issue 4
DOI: 10.1103/PhysRevB.90.041102

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

Kim, Jungho; Casa, D.; Upton, M. H.
Physical Review Letters, Vol. 108, Issue 17
DOI: 10.1103/PhysRevLett.108.177003

Magnetic and crystal structures of ${Sr}_{2} {IrO}_{4}$ : A neutron diffraction study
journal, April 2013

Ye, Feng; Chi, Songxue; Chakoumakos, Bryan C.
Physical Review B, Vol. 87, Issue 14
DOI: 10.1103/PhysRevB.87.140406

Pressure Tuning of the Spin-Orbit Coupled Ground State in ${Sr}_{2} {IrO}_{4}$
journal, July 2012

Haskel, D.; Fabbris, G.; Zhernenkov, Mikhail
Physical Review Letters, Vol. 109, Issue 2
DOI: 10.1103/PhysRevLett.109.027204

Pressure-induced insulating state in ${Ba}_{1 - x} R_{x} {IrO}_{3}$ ( $R = Gd$ , Eu) single crystals
journal, January 2010

Korneta, O. B.; Chikara, S.; Parkin, S.
Physical Review B, Vol. 81, Issue 4
DOI: 10.1103/PhysRevB.81.045101

Different response of transport and magnetic properties of ${BaIrO}_{3}$ to chemical and physical pressure
journal, July 2014

Laguna-Marco, M. A.; Fabbris, G.; Souza-Neto, N. M.
Physical Review B, Vol. 90, Issue 1
DOI: 10.1103/PhysRevB.90.014419

Pressure dependence of the structure and electronic properties of ${Sr}_{3} {Ir}_{2} O_{7}$
journal, May 2016

Donnerer, C.; Feng, Z.; Vale, J. G.
Physical Review B, Vol. 93, Issue 17
DOI: 10.1103/PhysRevB.93.174118

Electron-doped ${Sr}_{2} {IrO}_{4 - δ}$ $(0 \leq δ \leq 0.04)$ : Evolution of a disordered $J_{eff} = \frac{1}{2}$ Mott insulator into an exotic metallic state
journal, September 2010

Korneta, O. B.; Qi, Tongfei; Chikara, S.
Physical Review B, Vol. 82, Issue 11
DOI: 10.1103/PhysRevB.82.115117

Lattice-driven magnetoresistivity and metal-insulator transition in single-layered iridates
journal, September 2011

Ge, M.; Qi, T. F.; Korneta, O. B.
Physical Review B, Vol. 84, Issue 10
DOI: 10.1103/PhysRevB.84.100402

Influence of electron doping on the ground state of $({Sr}_{1 - x} {La}_{x})_{2} {IrO}_{4}$
journal, August 2015

Chen, Xiang; Hogan, Tom; Walkup, D.
Physical Review B, Vol. 92, Issue 7
DOI: 10.1103/PhysRevB.92.075125

Spin-orbit tuned metal-insulator transitions in single-crystal Sr $_{2}$ Ir $_{1 - x}$ Rh $_{x}$ O $_{4}$ ( $0 \leq x \leq 1$ )
journal, September 2012

Qi, T. F.; Korneta, O. B.; Li, L.
Physical Review B, Vol. 86, Issue 12
DOI: 10.1103/PhysRevB.86.125105

Evolution of competing magnetic order in the $J_{eff} = 1 / 2$ insulating state of ${Sr}_{2} {Ir}_{1 - x} {Ru}_{x} O_{4}$
journal, October 2015

Calder, S.; Kim, J. W.; Cao, G. -X.
Physical Review B, Vol. 92, Issue 16
DOI: 10.1103/PhysRevB.92.165128

From $J_{eff} = 1 / 2$ insulator to $p$ -wave superconductor in single-crystal $S r_{2} I r_{1 - x} R u_{x} O_{4} (0 \leq x \leq 1)$
journal, December 2015

Yuan, S. J.; Aswartham, S.; Terzic, J.
Physical Review B, Vol. 92, Issue 24
DOI: 10.1103/PhysRevB.92.245103

Observation of a metal-to-insulator transition with both Mott-Hubbard and Slater characteristics in Sr $_{2}$ IrO $_{4}$ from time-resolved photocarrier dynamics
journal, July 2012

Hsieh, D.; Mahmood, F.; Torchinsky, D. H.
Physical Review B, Vol. 86, Issue 3
DOI: 10.1103/PhysRevB.86.035128

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

Wang, Fa; Senthil, T.
Physical Review Letters, Vol. 106, Issue 13
DOI: 10.1103/PhysRevLett.106.136402

Structural evolution and electronic properties of ${({Sr}_{1 - x} {Ca}_{x})}_{2 - y} {IrO}_{4 + z}$ spin-orbit-assisted insulators
journal, November 2016

Chen, Xiang; Wilson, Stephen D.
Physical Review B, Vol. 94, Issue 19
DOI: 10.1103/PhysRevB.94.195115

Optical signatures of spin-orbit exciton in bandwidth-controlled $S r_{2} Ir O_{4}$ epitaxial films via high-concentration Ca and Ba doping
journal, June 2017

Souri, M.; Kim, B. H.; Gruenewald, J. H.
Physical Review B, Vol. 95, Issue 23
DOI: 10.1103/PhysRevB.95.235125

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

Chikara, S.; Korneta, O.; Crummett, W. P.
Physical Review B, Vol. 80, Issue 14
DOI: 10.1103/PhysRevB.80.140407

Measurement of the internal magnetic field in the correlated iridates Ca $_{4}$ IrO $_{6}$ , Ca $_{5}$ Ir $_{3}$ O $_{12}$ , Sr $_{3}$ Ir $_{2}$ O $_{7}$ and Sr $_{2}$ IrO $_{4}$
journal, March 2011

Franke, I.; Baker, P. J.; Blundell, S. J.
Physical Review B, Vol. 83, Issue 9
DOI: 10.1103/PhysRevB.83.094416

Anomalous magnetic and transport behavior in the magnetic insulator ${Sr}_{3} {Ir}_{2} O_{7}$
journal, December 2002

Cao, G.; Xin, Y.; Alexander, C. S.
Physical Review B, Vol. 66, Issue 21
DOI: 10.1103/PhysRevB.66.214412

Decoupling of the antiferromagnetic and insulating states in Tb-doped $S r_{2} Ir O_{4}$
journal, December 2015

Wang, J. C.; Aswartham, S.; Ye, Feng
Physical Review B, Vol. 92, Issue 21
DOI: 10.1103/PhysRevB.92.214411

Schwinger boson spin-liquid states on square lattice
journal, July 2016

Yang, Xu; Wang, Fa
Physical Review B, Vol. 94, Issue 3
DOI: 10.1103/PhysRevB.94.035160

Atomically resolved spectroscopic study of Sr2IrO4: Experiment and theory
text, January 2013

Li, Qing; Cao, Guixin; Okamoto, Satoshi
ETH Zurich
DOI: 10.3929/ethz-b-000074026

Dimensionality controlled Mott transition and correlation effects in single- and bi-layer perovskite iridates
text, January 2012

Wang, Q.; Cao, Y.; Waugh, J. A.
arXiv
DOI: 10.48550/arxiv.1210.4141

Schwinger boson spin liquid states on square lattice
text, January 2015

Yang, Xu; Wang, Fa
arXiv
DOI: 10.48550/arxiv.1507.07621

Works referencing / citing this record:

Crossover between Mott and Efros-Shklovskii variable-range hopping in Sr ₂ IrO ₄ epitaxial thin films by misfit strain and isovalent doping
journal, November 2019

Souri, M.; Connell, J. G.; Nichols, J.
Journal of Applied Physics, Vol. 126, Issue 18
DOI: 10.1063/1.5122258

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Similar Records

Title: Decoupling of magnetism and electric transport in single-crystal (Sr1–xAx)2IrO4 (A = Ca or Ba)

Abstract

Citation Formats

Figures / Tables:

Atomically resolved spectroscopic study of Sr2IrO4: Experiment and theory journal, October 2013

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

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

Neutron Powder Diffraction Study of the Crystal Structures of Sr2RuO4 and Sr2IrO4 at Room Temperature and at 10 K journal, October 1994

Persistent non-metallic behavior in Sr 2 IrO 4 and Sr 3 Ir 2 O 7 at high pressures journal, June 2014

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

Localized-to-itinerant electron transition in Sr 2 Ir 1 − x Ru x O 4 journal, May 1994

Structural and magnetic studies of Sr 2 IrO 4 journal, April 1994

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

Dimensionality-controlled Mott transition and correlation effects in single-layer and bilayer perovskite iridates journal, June 2013

Two-Dimensional Heisenberg Behavior of J eff = 1 / 2 Isospins in the Paramagnetic State of the Spin-Orbital Mott Insulator Sr 2 IrO 4 journal, June 2012

Local density of states study of a spin-orbit-coupling induced Mott insulator Sr 2 Ir O 4 journal, July 2014

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

Magnetic and crystal structures of Sr 2 IrO 4 : A neutron diffraction study journal, April 2013

Pressure Tuning of the Spin-Orbit Coupled Ground State in Sr 2 IrO 4 journal, July 2012

Pressure-induced insulating state in Ba 1 − x R x IrO 3 ( R = Gd , Eu) single crystals journal, January 2010

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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

Lattice-driven magnetoresistivity and metal-insulator transition in single-layered iridates journal, September 2011

Influence of electron doping on the ground state of ( Sr 1 − x La x ) 2 IrO 4 journal, August 2015

Spin-orbit tuned metal-insulator transitions in single-crystal Sr 2 Ir 1 − x Rh x O 4 ( 0 ≤ x ≤ 1 ) journal, September 2012

Evolution of competing magnetic order in the J eff = 1 / 2 insulating state of Sr 2 Ir 1 − x Ru x O 4 journal, October 2015

From J eff = 1 / 2 insulator to p -wave superconductor in single-crystal S r 2 I r 1 − x R u x O 4 ( 0 ≤ x ≤ 1 ) journal, December 2015

Observation of a metal-to-insulator transition with both Mott-Hubbard and Slater characteristics in Sr 2 IrO 4 from time-resolved photocarrier dynamics journal, July 2012

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Structural evolution and electronic properties of ( Sr 1 − x Ca x ) 2 − y IrO 4 + z spin-orbit-assisted insulators journal, November 2016

Optical signatures of spin-orbit exciton in bandwidth-controlled S r 2 Ir O 4 epitaxial films via high-concentration Ca and Ba doping journal, June 2017

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

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Title: Decoupling of magnetism and electric transport in single-crystal (Sr_1–xA_x)₂IrO₄ (A = Ca or Ba)

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journal, October 2013

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

Hallmarks of the Mott-metal crossover in the hole-doped pseudospin-1/2 Mott insulator Sr2IrO4
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Novel $J_{eff} = 1 / 2$ Mott State Induced by Relativistic Spin-Orbit Coupling in ${Sr}_{2} {IrO}_{4}$
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Structural and magnetic studies of ${Sr}_{2}$ ${IrO}_{4}$
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Local density of states study of a spin-orbit-coupling induced Mott insulator ${Sr}_{2} Ir O_{4}$
journal, July 2014

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

Magnetic and crystal structures of ${Sr}_{2} {IrO}_{4}$ : A neutron diffraction study
journal, April 2013

Pressure Tuning of the Spin-Orbit Coupled Ground State in ${Sr}_{2} {IrO}_{4}$
journal, July 2012

Pressure-induced insulating state in ${Ba}_{1 - x} R_{x} {IrO}_{3}$ ( $R = Gd$ , Eu) single crystals
journal, January 2010

Different response of transport and magnetic properties of ${BaIrO}_{3}$ to chemical and physical pressure
journal, July 2014

Pressure dependence of the structure and electronic properties of ${Sr}_{3} {Ir}_{2} O_{7}$
journal, May 2016

Electron-doped ${Sr}_{2} {IrO}_{4 - δ}$ $(0 \leq δ \leq 0.04)$ : Evolution of a disordered $J_{eff} = \frac{1}{2}$ Mott insulator into an exotic metallic state
journal, September 2010

Lattice-driven magnetoresistivity and metal-insulator transition in single-layered iridates
journal, September 2011

Influence of electron doping on the ground state of $({Sr}_{1 - x} {La}_{x})_{2} {IrO}_{4}$
journal, August 2015

Spin-orbit tuned metal-insulator transitions in single-crystal Sr $_{2}$ Ir $_{1 - x}$ Rh $_{x}$ O $_{4}$ ( $0 \leq x \leq 1$ )
journal, September 2012

Evolution of competing magnetic order in the $J_{eff} = 1 / 2$ insulating state of ${Sr}_{2} {Ir}_{1 - x} {Ru}_{x} O_{4}$
journal, October 2015

From $J_{eff} = 1 / 2$ insulator to $p$ -wave superconductor in single-crystal $S r_{2} I r_{1 - x} R u_{x} O_{4} (0 \leq x \leq 1)$
journal, December 2015

Observation of a metal-to-insulator transition with both Mott-Hubbard and Slater characteristics in Sr $_{2}$ IrO $_{4}$ from time-resolved photocarrier dynamics
journal, July 2012

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

Structural evolution and electronic properties of ${({Sr}_{1 - x} {Ca}_{x})}_{2 - y} {IrO}_{4 + z}$ spin-orbit-assisted insulators
journal, November 2016

Optical signatures of spin-orbit exciton in bandwidth-controlled $S r_{2} Ir O_{4}$ epitaxial films via high-concentration Ca and Ba doping
journal, June 2017

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

Measurement of the internal magnetic field in the correlated iridates Ca $_{4}$ IrO $_{6}$ , Ca $_{5}$ Ir $_{3}$ O $_{12}$ , Sr $_{3}$ Ir $_{2}$ O $_{7}$ and Sr $_{2}$ IrO $_{4}$
journal, March 2011

Anomalous magnetic and transport behavior in the magnetic insulator ${Sr}_{3} {Ir}_{2} O_{7}$
journal, December 2002

Decoupling of the antiferromagnetic and insulating states in Tb-doped $S r_{2} Ir O_{4}$
journal, December 2015

Schwinger boson spin-liquid states on square lattice
journal, July 2016

Atomically resolved spectroscopic study of Sr2IrO4: Experiment and theory
text, January 2013

Dimensionality controlled Mott transition and correlation effects in single- and bi-layer perovskite iridates
text, January 2012

Schwinger boson spin liquid states on square lattice
text, January 2015

Crossover between Mott and Efros-Shklovskii variable-range hopping in Sr ₂ IrO ₄ epitaxial thin films by misfit strain and isovalent doping
journal, November 2019