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Title: Revisiting the Kitaev material candidacy of Ir 4 + double perovskite iridates

Abstract

Quantum magnets with significant bond-directional Ising interactions, so-called Kitaev materials, have attracted tremendous attention recently in the search for exotic spin liquid states. Here we present a comprehensive set of measurements that enables us to investigate the crystal structures, Ir 4+ single-ion properties, and magnetic ground states of the double perovskite iridates La 2BIrO 6 (B = Mg, Zn) and A 2CeIrO 6 (A = Ba, Sr) with a large nearest-neighbor distance >5 angstrom between Ir 4+ ions. Our neutron powder diffraction data on Ba 2CeIrO 6 can be refined in the cubic space group Fm$$\overline{3}$$m, while the other three systems are characterized by weak monoclinic structural distortions. Despite the variance in the noncubic crystal field experienced by the Ir 4+ ions in these materials, x-ray absorption spectroscopy and resonant inelastic x-ray scattering are consistent with J eff = 1/2 moments in all cases. Furthermore, neutron scattering and resonant magnetic x-ray scattering show that these systems host A-type antiferromagnetic order. These electronic and magnetic ground states are consistent with expectations for face-centered-cubic magnets with significant antiferromagnetic Kitaev exchange, which indicates that spacing magnetic ions far apart may be a promising design principle for uncovering additional Kitaev materials

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [4];  [4];  [5];  [6];  [6]; ORCiD logo [7]; ORCiD logo [7]; ORCiD logo [7]
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. McMaster Univ., Hamilton, ON (Canada)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Univ. of Illinois, Urbana-Champaign, IL (United States)
  5. Cornell Univ., Ithaca, NY (United States). Cornell High Energy Synchrotron Source (CHESS)
  6. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1530100
Alternate Identifier(s):
OSTI ID: 1506553; OSTI ID: 1515547
Grant/Contract Number:  
AC05-00OR22725; AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 99; Journal Issue: 13; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Aczel, Adam A., Clancy, James P., Chen, Qiang, Zhou, H. D., Reig-i-Plessis, D., MacDougall, Gregory J., Ruff, Jacob P. C., Upton, M. H., Islam, Z., Williams, Travis J., Calder, Stuart A., and Yan, J. -Q. Revisiting the Kitaev material candidacy of Ir4+ double perovskite iridates. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.99.134417.
Aczel, Adam A., Clancy, James P., Chen, Qiang, Zhou, H. D., Reig-i-Plessis, D., MacDougall, Gregory J., Ruff, Jacob P. C., Upton, M. H., Islam, Z., Williams, Travis J., Calder, Stuart A., & Yan, J. -Q. Revisiting the Kitaev material candidacy of Ir4+ double perovskite iridates. United States. https://doi.org/10.1103/PhysRevB.99.134417
Aczel, Adam A., Clancy, James P., Chen, Qiang, Zhou, H. D., Reig-i-Plessis, D., MacDougall, Gregory J., Ruff, Jacob P. C., Upton, M. H., Islam, Z., Williams, Travis J., Calder, Stuart A., and Yan, J. -Q. Thu . "Revisiting the Kitaev material candidacy of Ir4+ double perovskite iridates". United States. https://doi.org/10.1103/PhysRevB.99.134417. https://www.osti.gov/servlets/purl/1530100.
@article{osti_1530100,
title = {Revisiting the Kitaev material candidacy of Ir4+ double perovskite iridates},
author = {Aczel, Adam A. and Clancy, James P. and Chen, Qiang and Zhou, H. D. and Reig-i-Plessis, D. and MacDougall, Gregory J. and Ruff, Jacob P. C. and Upton, M. H. and Islam, Z. and Williams, Travis J. and Calder, Stuart A. and Yan, J. -Q.},
abstractNote = {Quantum magnets with significant bond-directional Ising interactions, so-called Kitaev materials, have attracted tremendous attention recently in the search for exotic spin liquid states. Here we present a comprehensive set of measurements that enables us to investigate the crystal structures, Ir4+ single-ion properties, and magnetic ground states of the double perovskite iridates La2BIrO6 (B = Mg, Zn) and A2CeIrO6 (A = Ba, Sr) with a large nearest-neighbor distance >5 angstrom between Ir4+ ions. Our neutron powder diffraction data on Ba2CeIrO6 can be refined in the cubic space group Fm$\overline{3}$m, while the other three systems are characterized by weak monoclinic structural distortions. Despite the variance in the noncubic crystal field experienced by the Ir4+ ions in these materials, x-ray absorption spectroscopy and resonant inelastic x-ray scattering are consistent with Jeff = 1/2 moments in all cases. Furthermore, neutron scattering and resonant magnetic x-ray scattering show that these systems host A-type antiferromagnetic order. These electronic and magnetic ground states are consistent with expectations for face-centered-cubic magnets with significant antiferromagnetic Kitaev exchange, which indicates that spacing magnetic ions far apart may be a promising design principle for uncovering additional Kitaev materials},
doi = {10.1103/PhysRevB.99.134417},
url = {https://www.osti.gov/biblio/1530100}, journal = {Physical Review B},
issn = {2469-9950},
number = 13,
volume = 99,
place = {United States},
year = {2019},
month = {4}
}

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Cited by: 6 works
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    Works referencing / citing this record:

    The effect of carrier doping on magnetism and electronic behavior in double perovskite La 2 ZnIrO 6
    journal, December 2019


    Spin-orbit entangled j = 1 2 moments in Ba 2 CeIrO 6 : A frustrated fcc quantum magnet
    journal, August 2019


    Octupolar order in d -orbital Mott insulators
    journal, February 2020


    Study of nontrivial magnetism in 3 d 5 d transition metal based double perovskites
    journal, February 2020


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    journal, April 2019


    Kitaev magnetism and fractionalized excitations in double perovskite S m 2 ZnIr O 6
    journal, January 2020