Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate (Nd1–xCax)2Ir2O7

Porter, Zach; Zoghlin, Eli; Britner, Samuel; Husremovic, Samra; Ruff, Jacob P.C.; Choi, Yongseong; Haskel, Daniel; Laurita, Geneva; Wilson, Stephen D.

doi:10.1103/PhysRevB.100.054409

Title: Evolution of structure and magnetism across the metal-insulator transition in the pyrochlore iridate ${({Nd}_{1 - x} {Ca}_{x})}_{2} {Ir}_{2} O_{7}$

Journal Article · 08 August 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.100.054409 · OSTI ID:1577100

Porter, Zach ^[1]; Zoghlin, Eli ^[1]; Britner, Samuel ^[2]; Husremovic, Samra ^[2]; Ruff, Jacob P.C. ^[3]; Choi, Yongseong ^[4]; Haskel, Daniel ^[4];

^[2]; Wilson, Stephen D. ^[1]

Univ. of California, Santa Barbara, CA (United States)
Bates College, Lewiston, ME (United States)
Cornell Univ., Ithaca, NY (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

We report on the evolution of the thermal metal-insulator transition in polycrystalline samples of Nd₂Ir₂O₇ upon hole doping via substitution of Ca²⁺ for Nd³⁺. Ca substitution mediates a filling-controlled Mott-like transition with minimal resolvable structural changes and without altering site symmetry. Local structure confirms that Ca substitution does not result in local chemical phase separation, and absorption spectroscopy establishes that Ir cations maintain a spin-orbit entangled electronic configuration. The metal-insulator transition coincides with antiferromagnetic ordering on the Ir sublattice for all measured samples, and both decrease in onset temperature with Ca content. As a result, weak low-temperature upturns in susceptibility and resistivity for samples with high Ca content suggest that Nd sublattice antiferromagnetism continues to couple to carriers in the metallic regime.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: US Army Research Office (ARO); National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1577100

Alternate ID(s):: OSTI ID: 1550583

Journal Information:: Physical Review B, Vol. 100, Issue 5; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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References (55)

Comparative study of low-temperature x-ray diffraction experiments on R 2 Ir 2 O 7 ( R = Nd , Eu, and Pr) Takatsu, Hiroshi; Watanabe, Kunihiko; Goto, Kazuki Physical Review B, Vol. 90, Issue 23 https://doi.org/10.1103/PhysRevB.90.235110	journal	December 2014
Coulombic Quantum Liquids in Spin- 1 / 2 Pyrochlores Savary, Lucile; Balents, Leon Physical Review Letters, Vol. 108, Issue 3 https://doi.org/10.1103/PhysRevLett.108.037202	journal	January 2012
Magnetization and Hall effect studies on the pyrochlore iridate Nd 2 Ir 2 O 7 Disseler, S. M.; Giblin, S. R.; Dhital, Chetan Physical Review B, Vol. 87, Issue 6 https://doi.org/10.1103/PhysRevB.87.060403	journal	February 2013
Magnetic pyrochlore oxides Gardner, Jason S.; Gingras, Michel J. P.; Greedan, John E. Reviews of Modern Physics, Vol. 82, Issue 1 https://doi.org/10.1103/RevModPhys.82.53	journal	January 2010
Dilute stuffing in the pyrochlore iridate Eu 2 Ir 2 O 7 Telang, Prachi; Mishra, Kshiti; Sood, A. K. Physical Review B, Vol. 97, Issue 23 https://doi.org/10.1103/PhysRevB.97.235118	journal	June 2018
Robust pinning of magnetic moments in pyrochlore iridates Yang, W. C.; Zhu, W. K.; Zhou, H. D. Physical Review B, Vol. 96, Issue 9 https://doi.org/10.1103/PhysRevB.96.094437	journal	September 2017
Topological and magnetic phases of interacting electrons in the pyrochlore iridates Witczak-Krempa, William; Kim, Yong Baek Physical Review B, Vol. 85, Issue 4 https://doi.org/10.1103/PhysRevB.85.045124	journal	January 2012
Variation of Charge Dynamics in the Course of Metal-Insulator Transition for Pyrochlore-Type Nd 2 Ir 2 O 7 Ueda, K.; Fujioka, J.; Takahashi, Y. Physical Review Letters, Vol. 109, Issue 13 https://doi.org/10.1103/PhysRevLett.109.136402	journal	September 2012
Iridates from the molecular side Pedersen, Kasper S.; Bendix, Jesper; Tressaud, Alain Nature Communications, Vol. 7, Issue 1 https://doi.org/10.1038/ncomms12195	journal	July 2016
Spin-orbit coupling in iridium-based 5 d compounds probed by x-ray absorption spectroscopy Clancy, J. P.; Chen, N.; Kim, C. Y. Physical Review B, Vol. 86, Issue 19 https://doi.org/10.1103/PhysRevB.86.195131	journal	November 2012
Novel J eff = 1 / 2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr 2 IrO 4 Kim, B. J.; Jin, Hosub; Moon, S. J. Physical Review Letters, Vol. 101, Issue 7 https://doi.org/10.1103/PhysRevLett.101.076402	journal	August 2008
Correlated Quantum Phenomena in the Strong Spin-Orbit Regime Witczak-Krempa, William; Chen, Gang; Kim, Yong Baek Annual Review of Condensed Matter Physics, Vol. 5, Issue 1 https://doi.org/10.1146/annurev-conmatphys-020911-125138	journal	March 2014
Phase Diagram of Pyrochlore Iridates: All-in–All-out Magnetic Ordering and Non-Fermi-Liquid Properties Shinaoka, Hiroshi; Hoshino, Shintaro; Troyer, Matthias Physical Review Letters, Vol. 115, Issue 15 https://doi.org/10.1103/PhysRevLett.115.156401	journal	October 2015
Enhanced weak ferromagnetism and conductivity in hole-doped pyrochlore iridate Y 2 Ir 2 O 7 Zhu, W. K.; Wang, M.; Seradjeh, B. Physical Review B, Vol. 90, Issue 5 https://doi.org/10.1103/PhysRevB.90.054419	journal	August 2014
Enhanced thermopower in the correlated semimetallic phase of hole-doped pyrochlore iridates Kaneko, R.; Huebsch, M. -T.; Sakai, S. Physical Review B, Vol. 99, Issue 16 https://doi.org/10.1103/PhysRevB.99.161104	journal	April 2019
Odd-parity magnetoresistance in pyrochlore iridate thin films with broken time-reversal symmetry Fujita, T. C.; Kozuka, Y.; Uchida, M. Scientific Reports, Vol. 5, Issue 1 https://doi.org/10.1038/srep09711	journal	May 2015
Similarities and Differences in the Structural and Electronic Properties of Ruthenium and Iridium PyrochloresA2M2O7−y(M=Ru, Ir) Koo, H. -J.; Whangbo, M. -H.; Kennedy, B. J. Journal of Solid State Chemistry, Vol. 136, Issue 2 https://doi.org/10.1006/jssc.1997.7705	journal	March 1998
Time-reversal symmetry breaking and spontaneous Hall effect without magnetic dipole order Machida, Yo; Nakatsuji, Satoru; Onoda, Shigeki Nature, Vol. 463, Issue 7278 https://doi.org/10.1038/nature08680	journal	December 2009
Metallic Spin-Liquid Behavior of the Geometrically Frustrated Kondo Lattice Pr 2 Ir 2 O 7 Nakatsuji, S.; Machida, Y.; Maeno, Y. Physical Review Letters, Vol. 96, Issue 8 https://doi.org/10.1103/PhysRevLett.96.087204	journal	March 2006
Magnetic Field-Induced Insulator-Semimetal Transition in a Pyrochlore Nd 2 Ir 2 O 7 Ueda, K.; Fujioka, J.; Yang, B. -J. Physical Review Letters, Vol. 115, Issue 5 https://doi.org/10.1103/PhysRevLett.115.056402	journal	July 2015
Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate Ueda, Kentaro; Kaneko, Ryoma; Ishizuka, Hiroaki Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-05530-9	journal	August 2018
Slater to Mott Crossover in the Metal to Insulator Transition of Nd 2 Ir 2 O 7 Nakayama, M.; Kondo, Takeshi; Tian, Z. Physical Review Letters, Vol. 117, Issue 5 https://doi.org/10.1103/PhysRevLett.117.056403	journal	July 2016
Longer-range lattice anisotropy strongly competing with spin-orbit interactions in pyrochlore iridates Hozoi, L.; Gretarsson, H.; Clancy, J. P. Physical Review B, Vol. 89, Issue 11 https://doi.org/10.1103/PhysRevB.89.115111	journal	March 2014
PDFfit2 and PDFgui: computer programs for studying nanostructure in crystals Farrow, C. L.; Juhas, P.; Liu, J. W. Journal of Physics: Condensed Matter, Vol. 19, Issue 33 https://doi.org/10.1088/0953-8984/19/33/335219	journal	July 2007
Magnetic order in the pyrochlore iridate Nd 2 Ir 2 O 7 probed by muon spin relaxation Guo, Hanjie; Matsuhira, Kazuyuki; Kawasaki, Ikuto Physical Review B, Vol. 88, Issue 6 https://doi.org/10.1103/PhysRevB.88.060411	journal	August 2013
Kitaev-Heisenberg models for iridates on the triangular, hyperkagome, kagome, fcc, and pyrochlore lattices Kimchi, Itamar; Vishwanath, Ashvin Physical Review B, Vol. 89, Issue 1 https://doi.org/10.1103/PhysRevB.89.014414	journal	January 2014
Metal–Insulator Transitions in Pyrochlore Oxides Ln ₂ Ir ₂ O ₇ Matsuhira, Kazuyuki; Wakeshima, Makoto; Hinatsu, Yukio Journal of the Physical Society of Japan, Vol. 80, Issue 9 https://doi.org/10.1143/JPSJ.80.094701	journal	September 2011
Crystal growth and structure of R2Ir2O7 (R=Pr, Eu) using molten KF Millican, Jasmine N.; Macaluso, Robin T.; Nakatsuji, Satoru Materials Research Bulletin, Vol. 42, Issue 5 https://doi.org/10.1016/j.materresbull.2006.08.011	journal	May 2007
Orbital Magnetism and Spin-Orbit Effects in the Electronic Structure of BaIrO 3 Laguna-Marco, M. A.; Haskel, D.; Souza-Neto, N. Physical Review Letters, Vol. 105, Issue 21 https://doi.org/10.1103/PhysRevLett.105.216407	journal	November 2010
Optical evidence for a Weyl semimetal state in pyrochlore Eu 2 Ir 2 O 7 Sushkov, A. B.; Hofmann, J. B.; Jenkins, G. S. Physical Review B, Vol. 92, Issue 24 https://doi.org/10.1103/PhysRevB.92.241108	journal	December 2015
Pressure and magnetic field effects on metal-insulator transitions of bulk and domain wall states in pyrochlore iridates Ueda, K.; Fujioka, J.; Terakura, C. Physical Review B, Vol. 92, Issue 12 https://doi.org/10.1103/PhysRevB.92.121110	journal	September 2015
Magnetic order and the electronic ground state in the pyrochlore iridate Nd 2 Ir 2 O 7 Disseler, S. M.; Dhital, Chetan; Hogan, T. C. Physical Review B, Vol. 85, Issue 17 https://doi.org/10.1103/PhysRevB.85.174441	journal	May 2012
PDFgetX2: a GUI-driven program to obtain the pair distribution function from X-ray powder diffraction data Qiu, Xiangyun; Thompson, Jeroen W.; Billinge, Simon J. L. Journal of Applied Crystallography, Vol. 37, Issue 4, p. 678-678 https://doi.org/10.1107/S0021889804011744	journal	July 2004
Dilute magnetism and spin-orbital percolation effects in Sr 2 Ir 1 − x Rh x O 4 Clancy, J. P.; Lupascu, A.; Gretarsson, H. Physical Review B, Vol. 89, Issue 5 https://doi.org/10.1103/PhysRevB.89.054409	journal	February 2014
Bi _{2– x} Ca _x Ir ₂ O _{6+ y} Pyrochlore Phases: Structure and Properties with Varied Ir Oxidation State from 3.9+ to 4.3+ Giampaoli, Gabriella; Li, Jun; Ramirez, Arthur P. Inorganic Chemistry, Vol. 56, Issue 8 https://doi.org/10.1021/acs.inorgchem.7b00345	journal	April 2017
New Type of Quantum Criticality in the Pyrochlore Iridates Savary, Lucile; Moon, Eun-Gook; Balents, Leon Physical Review X, Vol. 4, Issue 4 https://doi.org/10.1103/PhysRevX.4.041027	journal	November 2014
Anomalous domain-wall conductance in pyrochlore-type Nd 2 Ir 2 O 7 on the verge of the metal-insulator transition Ueda, K.; Fujioka, J.; Takahashi, Y. Physical Review B, Vol. 89, Issue 7 https://doi.org/10.1103/PhysRevB.89.075127	journal	February 2014
X-ray circular dichroism as a probe of orbital magnetization Thole, B. T.; Carra, P.; Sette, F. Physical Review Letters, Vol. 68, Issue 12 https://doi.org/10.1103/PhysRevLett.68.1943	journal	March 1992
Observation of non-Fermi liquid behavior in hole-doped Eu 2 Ir 2 O 7 Banerjee, A.; Sannigrahi, J.; Giri, S. Physical Review B, Vol. 96, Issue 22 https://doi.org/10.1103/PhysRevB.96.224426	journal	December 2017
Field-induced quantum metal–insulator transition in the pyrochlore iridate Nd2Ir2O7 Tian, Zhaoming; Kohama, Yoshimitsu; Tomita, Takahiro Nature Physics, Vol. 12, Issue 2 https://doi.org/10.1038/nphys3567	journal	November 2015
Pressure Tuning of the Spin-Orbit Coupled Ground State in Sr 2 IrO 4 Haskel, D.; Fabbris, G.; Zhernenkov, Mikhail Physical Review Letters, Vol. 109, Issue 2 https://doi.org/10.1103/PhysRevLett.109.027204	journal	July 2012
Instrument for x-ray magnetic circular dichroism measurements at high pressures Haskel, D.; Tseng, Y. C.; Lang, J. C. Review of Scientific Instruments, Vol. 78, Issue 8 https://doi.org/10.1063/1.2773800	journal	August 2007
Variation of optical conductivity spectra in the course of bandwidth-controlled metal-insulator transitions in pyrochlore iridates Ueda, K.; Fujioka, J.; Tokura, Y. Physical Review B, Vol. 93, Issue 24 https://doi.org/10.1103/PhysRevB.93.245120	journal	June 2016
Mobile metallic domain walls in an all-in-all-out magnetic insulator Ma, E. Y.; Cui, Y. -T.; Ueda, K. Science, Vol. 350, Issue 6260 https://doi.org/10.1126/science.aac8289	journal	October 2015
Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates Wan, Xiangang; Turner, Ari M.; Vishwanath, Ashvin Physical Review B, Vol. 83, Issue 20 https://doi.org/10.1103/PhysRevB.83.205101	journal	May 2011
Two-dimensional detector software: From real detector to idealised image or two-theta scan Hammersley, A. P.; Svensson, S. O.; Hanfland, M. High Pressure Research, Vol. 14, Issue 4-6, p. 235-248 https://doi.org/10.1080/08957959608201408	journal	January 1996
Metal–Insulator Transition in Pyrochlore Iridates Ln ₂ Ir ₂ O ₇ ( Ln = Nd, Sm, and Eu) Matsuhira, Kazuyuki; Wakeshima, Makoto; Nakanishi, Ryo Journal of the Physical Society of Japan, Vol. 76, Issue 4 https://doi.org/10.1143/JPSJ.76.043706	journal	April 2007
Spin-Orbit Coupling in Iridium-Based 5d Compounds Probed by X-ray Absorption Spectroscopy Clancy, J. P.; Chen, N.; Kim, C. Y. arXiv https://doi.org/10.48550/arxiv.1205.6540	text	January 2012
Correlated quantum phenomena in the strong spin-orbit regime Witczak-Krempa, William; Chen, Gang; Kim, Yong Baek arXiv https://doi.org/10.48550/arxiv.1305.2193	text	January 2013
A New Type of Quantum Criticality in the Pyrochlore Iridates Savary, Lucile; Moon, Eun-Gook; Balents, Leon arXiv https://doi.org/10.48550/arxiv.1403.5255	text	January 2014
Enhanced weak ferromagnetism and conductivity in hole-doped pyrochlore iridate Y2Ir2O7 Zhu, W. K.; Wang, M.; Seradjeh, B. arXiv https://doi.org/10.48550/arxiv.1501.00615	text	January 2015
Phase diagram of pyrochlore iridates: all-in-all-out magnetic ordering and non-Fermi liquid properties Shinaoka, Hiroshi; Hoshino, Shintaro; Troyer, Matthias arXiv https://doi.org/10.48550/arxiv.1504.03962	text	January 2015
Pressure and magnetic-field effects on metal-insulator transitions of bulk and domain-wall states in pyrochlore iridates Ueda, K.; Fujioka, J.; Terakura, C. arXiv https://doi.org/10.48550/arxiv.1507.04804	text	January 2015
Robust pinning of magnetic moments in pyrochlore iridates Yang, W. C.; Zhu, W. K.; Zhou, H. D. arXiv https://doi.org/10.48550/arxiv.1705.01093	text	January 2017
Dilute stuffing in the pyrochlore iridate $Eu_2Ir_2O_7$ Telang, Prachi; Mishra, Kshiti; Sood, A. K. arXiv https://doi.org/10.48550/arxiv.1805.01674	text	January 2018