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Title: Spin-wave gap collapse in Rh-doped Sr2IrO4

Abstract

We use resonant inelastic x-ray scattering (RIXS) at the Ir L3 edge to study the effect of hole doping upon the Jeff = 1 2 Mott-insulating state in Sr2IrO4, via Rh replacement of the Ir site. The spin-wave gap, associated with XY-type spin-exchange anisotropy, collapses with increasing Rh content, prior to the suppression of the Mott-insulating state and in contrast to electron doping via La substitution of the Sr site. At the same time, despite heavy damping, the d-d excitation spectra retain their overall amplitude and dispersion character. A careful study of the spin-wave spectrum reveals that deviations from the J1-J2-J3 Heisenberg used to model the pristine system disappear at intermediate doping levels. These findings are interpreted in terms of a modulation of Ir-Ir correlations due to the influence of Rh impurities upon nearby Ir wave functions, even as the single-band Jeff = 1 2 model remains valid up to full carrier delocalization. They underline the importance of the transition metal site symmetry when doping pseudospin systems such as Sr2IrO4.

Authors:
 [1]; ORCiD logo [2];  [1]; ORCiD logo [1];  [1];  [3]; ORCiD logo [4]; ORCiD logo [5];  [1];  [6]
  1. Max Planck Inst. for Solid State Research, Stuttgart (Germany)
  2. Pohang Univ. of Science and Technology (South Korea); Inst. for Basic Science (IBS), Pohang (South Korea). Center for Artificial Low Dimensional Electronic Systems; Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. European Synchrotron (ESRF), Grenoble (France)
  4. Diamond Light Source Ltd., Didcot (United Kingdom). Harwell Science and Innovation Campus
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  6. Max Planck Inst. for Solid State Research, Stuttgart (Germany); Pohang Univ. of Science and Technology (South Korea); Inst. for Basic Science (IBS), Pohang (South Korea). Center for Artificial Low Dimensional Electronic Systems
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
European Research Council (ERC); Institute for Basic Science; Alexander von Humboldt Foundation; National Research Foundation of Korea (NRF); USDOE Office of Science (SC)
OSTI Identifier:
1605964
Alternate Identifier(s):
OSTI ID: 1607867
Grant/Contract Number:  
AC02-06CH11357; 669550; 2018H1A2A1059958
Resource Type:
Published Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Magnetic interactions; spin-orbit coupling; iridates; resonant inelastic x-ray scattering

Citation Formats

Bertinshaw, J., Kim, J. K., Porras, J., Ueda, K., Sung, N. H., Efimenko, A., Bombardi, A., Kim, Jungho, Keimer, B., and Kim, B. J. Spin-wave gap collapse in Rh-doped Sr2IrO4. United States: N. p., 2020. Web. doi:10.1103/physrevb.101.094428.
Bertinshaw, J., Kim, J. K., Porras, J., Ueda, K., Sung, N. H., Efimenko, A., Bombardi, A., Kim, Jungho, Keimer, B., & Kim, B. J. Spin-wave gap collapse in Rh-doped Sr2IrO4. United States. https://doi.org/10.1103/physrevb.101.094428
Bertinshaw, J., Kim, J. K., Porras, J., Ueda, K., Sung, N. H., Efimenko, A., Bombardi, A., Kim, Jungho, Keimer, B., and Kim, B. J. Mon . "Spin-wave gap collapse in Rh-doped Sr2IrO4". United States. https://doi.org/10.1103/physrevb.101.094428.
@article{osti_1605964,
title = {Spin-wave gap collapse in Rh-doped Sr2IrO4},
author = {Bertinshaw, J. and Kim, J. K. and Porras, J. and Ueda, K. and Sung, N. H. and Efimenko, A. and Bombardi, A. and Kim, Jungho and Keimer, B. and Kim, B. J.},
abstractNote = {We use resonant inelastic x-ray scattering (RIXS) at the Ir L3 edge to study the effect of hole doping upon the Jeff = 12 Mott-insulating state in Sr2IrO4, via Rh replacement of the Ir site. The spin-wave gap, associated with XY-type spin-exchange anisotropy, collapses with increasing Rh content, prior to the suppression of the Mott-insulating state and in contrast to electron doping via La substitution of the Sr site. At the same time, despite heavy damping, the d-d excitation spectra retain their overall amplitude and dispersion character. A careful study of the spin-wave spectrum reveals that deviations from the J1-J2-J3 Heisenberg used to model the pristine system disappear at intermediate doping levels. These findings are interpreted in terms of a modulation of Ir-Ir correlations due to the influence of Rh impurities upon nearby Ir wave functions, even as the single-band Jeff = 12 model remains valid up to full carrier delocalization. They underline the importance of the transition metal site symmetry when doping pseudospin systems such as Sr2IrO4.},
doi = {10.1103/physrevb.101.094428},
journal = {Physical Review B},
number = 9,
volume = 101,
place = {United States},
year = {2020},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/physrevb.101.094428

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Cited by: 6 works
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