by Gretarsson, H., Sung, N. H., Porras, J., Bertinshaw, J. and Dietl, C., Bruin, Jan A. N., Bangura, A. F., Kim, Y. K. and Dinnebier, R., Kim, Jungho, Al-Zein, A., Sala, M. Moretti and Krisch, M., Le Tacon, M., Keimer, B. and Kim, B. J.
Abstract:
We have studied the magnetic excitations of electron-doped Sr2-xLaxIrO4 (0 <= x <= 0.10) using resonant inelastic x-ray scattering at the Ir L-3 edge. The long-range magnetic order is rapidly lost with increasing x, but two-dimensional short-range order (SRO) and dispersive magnon excitations with nearly undiminished spectral weight persist well into the metallic part of the phase diagram. The magnons in the SRO phase are heavily damped and exhibit anisotropic softening. Their dispersions are well described by a pseudospin-1/2 Heisenberg model with exchange interactions whose spatial range increases with doping. We also find a doping-independent high-energy magnetic continuum, which is not described by this model. The spin-orbit excitons arising from the pseudospin-3/2 manifold of the Ir ions broaden substantially in the SRO phase, but remain largely separated from the low-energy magnons. Pseudospin-1/2 models are therefore a good starting point for the theoretical description of the low-energy magnetic dynamics of doped iridates.
Reference:
Persistent Paramagnons Deep in the Metallic Phase of Sr2-xLaxIrO4 (Gretarsson, H., Sung, N. H., Porras, J., Bertinshaw, J. and Dietl, C., Bruin, Jan A. N., Bangura, A. F., Kim, Y. K. and Dinnebier, R., Kim, Jungho, Al-Zein, A., Sala, M. Moretti and Krisch, M., Le Tacon, M., Keimer, B. and Kim, B. J.), In PHYSICAL REVIEW LETTERS, AMER PHYSICAL SOC, volume 117, 2016.
Bibtex Entry:
@article{ ISI:000383043600015,
Author = {Gretarsson, H. and Sung, N. H. and Porras, J. and Bertinshaw, J. and
Dietl, C. and Bruin, Jan A. N. and Bangura, A. F. and Kim, Y. K. and
Dinnebier, R. and Kim, Jungho and Al-Zein, A. and Sala, M. Moretti and
Krisch, M. and Le Tacon, M. and Keimer, B. and Kim, B. J.},
Title = {{Persistent Paramagnons Deep in the Metallic Phase of Sr2-xLaxIrO4}},
Journal = {{PHYSICAL REVIEW LETTERS}},
Year = {{2016}},
Volume = {{117}},
Number = {{10}},
Month = {{SEP 1}},
Abstract = {{We have studied the magnetic excitations of electron-doped Sr2-xLaxIrO4
(0 <= x <= 0.10) using resonant inelastic x-ray scattering at the Ir L-3
edge. The long-range magnetic order is rapidly lost with increasing x,
but two-dimensional short-range order (SRO) and dispersive magnon
excitations with nearly undiminished spectral weight persist well into
the metallic part of the phase diagram. The magnons in the SRO phase are
heavily damped and exhibit anisotropic softening. Their dispersions are
well described by a pseudospin-1/2 Heisenberg model with exchange
interactions whose spatial range increases with doping. We also find a
doping-independent high-energy magnetic continuum, which is not
described by this model. The spin-orbit excitons arising from the
pseudospin-3/2 manifold of the Ir ions broaden substantially in the SRO
phase, but remain largely separated from the low-energy magnons.
Pseudospin-1/2 models are therefore a good starting point for the
theoretical description of the low-energy magnetic dynamics of doped
iridates.}},
Publisher = {{AMER PHYSICAL SOC}},
Address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{Gretarsson, H (Corresponding Author), Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany.
Gretarsson, H.; Sung, N. H.; Porras, J.; Bertinshaw, J.; Dietl, C.; Bruin, Jan A. N.; Bangura, A. F.; Dinnebier, R.; Le Tacon, M.; Keimer, B.; Kim, B. J., Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany.
Kim, Y. K., Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA.
Kim, Y. K., Inst for Basic Sci Korea, Ctr Correlated Electron Syst, Seoul 151742, South Korea.
Kim, Y. K., Seoul Natl Univ, Dept Phys & Astron, Seoul 151747, South Korea.
Kim, Jungho, Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
Al-Zein, A.; Sala, M. Moretti; Krisch, M., European Synchrotron Radiat Facil, BP 220, F-38043 Grenoble, France.
Le Tacon, M., Karlsruhe Inst Technol, Inst Festkorperphys, Hermann v Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany.}},
DOI = {{10.1103/PhysRevLett.117.107001}},
Article-Number = {{107001}},
ISSN = {{0031-9007}},
EISSN = {{1079-7114}},
Keywords-Plus = {{HIGH-ENERGY SPIN; HIGH-TEMPERATURE SUPERCONDUCTIVITY; X-RAY-SCATTERING;
MAGNETIC EXCITATIONS}},
Research-Areas = {{Physics}},
Web-of-Science-Categories = {{Physics, Multidisciplinary}},
ResearcherID-Numbers = {{Dinnebier, Robert/B-5642-2015
Moretti, Marco/AAF-9255-2019
, Le Tacon Matthieu/D-8023-2011
Sala, Marco Moretti/H-1034-2014
Krisch, Michael H/U-5662-2018
Kim, Yeong Kwan/L-8207-2016
Zein, Ali Al/F-4393-2019
Gretarsson, Hlynur/M-5141-2017}},
ORCID-Numbers = {{Dinnebier, Robert/0000-0003-2778-2113
Moretti, Marco/0000-0002-9744-9976
, Le Tacon Matthieu/0000-0002-5838-3724
Sala, Marco Moretti/0000-0002-9744-9976
Krisch, Michael H/0000-0001-7423-1715
}},
Funding-Acknowledgement = {{Alexander von Humboldt FoundationAlexander von Humboldt Foundation;
DFGGerman Research Foundation (DFG) {[}TRR80]}},
Funding-Text = {{We would like to thank G. Jackeli, G. Khaliullin, and R. Coldea for
fruitful discussions. N. H. Sung was supported by the Alexander von
Humboldt Foundation. We acknowledge financial support by the DFG under
Grant No. TRR80.}},
Number-of-Cited-References = {{40}},
Times-Cited = {{40}},
Usage-Count-Last-180-days = {{3}},
Usage-Count-Since-2013 = {{64}},
Journal-ISO = {{Phys. Rev. Lett.}},
Doc-Delivery-Number = {{DV6KG}},
Unique-ID = {{ISI:000383043600015}},
DA = {{2020-12-22}},
}
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