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Title: X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations

Abstract

We have investigated the structural, electronic, and magnetic properties of the pyrochlore iridates Eu 2Ir 2O 7 and Pr 2Ir 2O 7 using a combination of resonant elastic x-ray scattering, x-ray powder diffraction, and resonant inelastic x-ray scattering (RIXS). The structural parameters of Eu 2Ir 2O 7 have been examined as a function of temperature and applied pressure, with a particular emphasis on regions of the phase diagram where electronic and magnetic phase transitions have been reported. We find no evidence of crystal symmetry change over the range of temperatures (~6 to 300 K) and pressures (~0.1 to 17 GPa) studied. We have also investigated the electronic and magnetic excitations in single-crystal samples of Eu 2Ir 2O 7 and Pr 2Ir 2O 7 using high-resolution Ir L- 3-edge RIXS. In spite of very different ground state properties, we find that these materials exhibit qualitatively similar excitation spectra, with crystal field excitations at ~3-5 eV, spin-orbit excitations at ~ 0.5-1 eV, and broad low-lying excitations below ~0.15 eV. In single-crystal samples of "Eu-rich" Eu 2Ir 2O 7 (found to possess an actual stoichiometry of Eu 2.18Ir 1.82O 7.06) we observe highly damped magnetic excitations at ~45 meV, which display significant momentummore » dependence. Here, we compare these results with recent dynamical structure factor calculations« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [4];  [1];  [1];  [1]
  1. Univ. of Toronto, Toronto, ON (Canada)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Seoul National Univ., Seoul (Korea, Republic of)
  4. Univ. of Ottawa, Ottawa, ON (Canada)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Canada Foundation for Innovation (CFI)
OSTI Identifier:
1339452
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 2; 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

Citation Formats

Clancy, J. P., Gretarsson, H., Lee, E. K. H., Tian, Di, Kim, J., Upton, M. H., Casa, D., Gog, T., Islam, Z., Jeon, Byung -Gu, Kim, Kee Hoon, Desgreniers, S., Kim, Yong Baek, Julian, S. J., and Kim, Young -June. X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.024408.
Clancy, J. P., Gretarsson, H., Lee, E. K. H., Tian, Di, Kim, J., Upton, M. H., Casa, D., Gog, T., Islam, Z., Jeon, Byung -Gu, Kim, Kee Hoon, Desgreniers, S., Kim, Yong Baek, Julian, S. J., & Kim, Young -June. X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations. United States. https://doi.org/10.1103/PhysRevB.94.024408
Clancy, J. P., Gretarsson, H., Lee, E. K. H., Tian, Di, Kim, J., Upton, M. H., Casa, D., Gog, T., Islam, Z., Jeon, Byung -Gu, Kim, Kee Hoon, Desgreniers, S., Kim, Yong Baek, Julian, S. J., and Kim, Young -June. Wed . "X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations". United States. https://doi.org/10.1103/PhysRevB.94.024408. https://www.osti.gov/servlets/purl/1339452.
@article{osti_1339452,
title = {X-ray scattering study of pyrochlore iridates: Crystal structure, electronic, and magnetic excitations},
author = {Clancy, J. P. and Gretarsson, H. and Lee, E. K. H. and Tian, Di and Kim, J. and Upton, M. H. and Casa, D. and Gog, T. and Islam, Z. and Jeon, Byung -Gu and Kim, Kee Hoon and Desgreniers, S. and Kim, Yong Baek and Julian, S. J. and Kim, Young -June},
abstractNote = {We have investigated the structural, electronic, and magnetic properties of the pyrochlore iridates Eu2Ir2O7 and Pr2Ir2O7 using a combination of resonant elastic x-ray scattering, x-ray powder diffraction, and resonant inelastic x-ray scattering (RIXS). The structural parameters of Eu2Ir2O7 have been examined as a function of temperature and applied pressure, with a particular emphasis on regions of the phase diagram where electronic and magnetic phase transitions have been reported. We find no evidence of crystal symmetry change over the range of temperatures (~6 to 300 K) and pressures (~0.1 to 17 GPa) studied. We have also investigated the electronic and magnetic excitations in single-crystal samples of Eu2Ir2O7 and Pr2Ir2O7 using high-resolution Ir L-3-edge RIXS. In spite of very different ground state properties, we find that these materials exhibit qualitatively similar excitation spectra, with crystal field excitations at ~3-5 eV, spin-orbit excitations at ~ 0.5-1 eV, and broad low-lying excitations below ~0.15 eV. In single-crystal samples of "Eu-rich" Eu2Ir2O7 (found to possess an actual stoichiometry of Eu2.18Ir1.82O7.06) we observe highly damped magnetic excitations at ~45 meV, which display significant momentum dependence. Here, we compare these results with recent dynamical structure factor calculations},
doi = {10.1103/PhysRevB.94.024408},
url = {https://www.osti.gov/biblio/1339452}, journal = {Physical Review B},
issn = {2469-9950},
number = 2,
volume = 94,
place = {United States},
year = {2016},
month = {7}
}

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