resonant inelastic x-ray scattering (rixs) study of lasrcuo4 · web of science search: rixs or...
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Young-June Kim
IXS2019, June 24
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RIXS snapshot Part I: Magnons Curpates Iridates Square lattice iridates – comparison with cuprates Other iridates – magnons at lower energy scale
Part II: Orbital excitations Non-dispersive dd excitations Collective spin-orbit excitations Future
Conclusions
Outline
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Acknowledgements
H. GretarssonJ. P. Clancy
Diego Casa, Jungho Kim, Mary Upton, Thomas GogArgonne
S. H. ChunBo Yuan A. LupascuB. Lebert K. Plumb
Changyong Kim, Ning Chen, Yongfeng HuCLS
Zhaoming Tian, Yang Qiu, Satoru Nakatsuji
Namjung Hur, Kee Hoon Kim, T. W. NohG. Cao, S. S. A. Seo
H.Y. Kee, A. Paramekanti
Jeroen van den Brink, Liviu Hozoi, V. Katukuri
DresdenU Tokyo
SNU/InhaKentucky/Colorado
Toronto
Y. Singh, P. GegenwartGottingen/IISER NSLS IIV. Bisogni, I. Jarrige
W. Jin S. Kim
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RIXS is growing
Web of Science Search: RIXS or Resonant Inelastic X-ray Scattering
0
20
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60
80
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140
Num
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Publication Year
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RIXS is global
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Total 1656 publications “Copper” or “Cuprates” mentioned in 226 pubs (still
many more than anything else.
RIXS is diverse
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Core-level RIXS useful for studying electronic structure Valence RIXS – collective excitations (momentum
dependence)
RIXS is useful
Ament et al. Reviews of Modern Physics 2011
CEF
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Overview (incomplete)
Soft Hard Tender Ligand
Following talk by Kurt Kummer
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Magnons
Ament et al. Reviews of Modern Physics 2011
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First, Bimagnon
La2CuO4
on-resonance
off-resonance
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Sr2IrO4 – magnons with hard RIXS
Jungho Kim et al. PRL 108, 177003 (2012)
Magnon
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INS/RIXS Comparison - magnons
YJK et al. Synch. Rad. News 2012
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Ligand RIXS – magnons
X. Lu, T. Schmitt et al. PRB 2018
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Magnetic phase diagram
X. Chen, S. Wilson et al. PRB 2015
xc ~ 0.04 xc ~ 0.17
Electron dopingSr2-xLaxIrO4
Hole dopingSr2Ir1-xRhxO4
J. P. Clancy et al. PRB 2014
Cuprates
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Magnon doping dependence
Gretarsson, BJ Kim et al. PRL 2016 J. P. Clancy, YJK et al. arXiv:1904.06402
e-doping Sr2-xLaxIrO4 Hole doping Sr2Ir1-xRhxO4
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Comparison with Doped Cuprates
Ishii et al, Nat. Comm. (2014)Le Tacon et al, Nat. Phys. (2011)
Nd2-xCexCuO4
W. S. Lee et al.Nat. Phys. (2015)
(Nd/Y)Ba2Cu3O6+x
M. Dean et al, Nat. Mater. (2011)
La2-xSrxCuO4
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Magnetic excitations Eu2Ir2O7
S. H. Chun, YJK et al. PRL 2018
Radav et al. PRMater. 2018
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Momentum dependenceDonnerer et al. PRL (2016)
Sm2Ir2O7
S. H. Chun et al. PRL 2018
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Temperature Dependence
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Temperature dep. – Cd2Os2O7
S. Calder et al. Nat. Comm. 2016
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Double perovskite iridatesW. Jin, YJK et al. unpublished
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Magnon dispersion can be measured with RIXS Square lattice materials easier due to large energy scales Low energy magnetic excitations are challenging
Usually not enough resolution to resolve different modes Temperature dependence often used to show magnetic nature
– not always straightforward to understand Background can have different origins and some depend on
temperatures Need a better strategy for magnon studies
A better energy resolution – e.g. flat crystal spectrometer design by Jungho Kim and Thomas Gog
Polarization analysis (hard x-ray) ?
Magnon summary
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ddOrbital
Spin-orbitCEF
Ament et al. Reviews of Modern Physics 2011
Excitations
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Momentum dependence
Gretarsson et al. PRL 2013
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Iridium and Rhenium DP
B. Yuan et al. PRB 2017 A. Paramekanti et al. PRB 2018
Talk by A. Paramekantiat 17:55 today
Ir5+ (5d4)
Re5+ (5d2)
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Osmium double perovskite (DP)
A. E. Taylor, A. D. Christianson et al. PRL 2017
Os5+ (5d3)
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Special Case I: spin chainNature 482, 82 (2012)
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Special Case II: Strong SOC
eg
t2g
(leff = -1)
CEF jeff = 1/2
jeff = 3/2SO
Ir4+ (5d5)
Jackeli and Khaliullin PRL 2009
↓+↓+↑ ,3
,3
,3
1 yzixzixy
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Sr2IrO4
Jungho Kim et al. Nature Communications, 2014
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Kitaev’s honeycomb model
𝐾𝐾𝑥𝑥𝑆𝑆𝑥𝑥𝑆𝑆𝑥𝑥
𝐾𝐾𝑦𝑦𝑆𝑆𝑦𝑦𝑆𝑆𝑦𝑦
𝐾𝐾𝑧𝑧𝑆𝑆𝑧𝑧𝑆𝑆𝑧𝑧
Exactly solvable model Ground state: Quantum Spin Liquid
Alexei Kitaev, Ann. Phys. 2006
ℋ𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾 = −�𝐾𝐾,𝛾𝛾
𝐾𝐾𝛾𝛾𝑆𝑆𝐾𝐾𝛾𝛾𝑆𝑆𝐾𝐾+𝐾𝐾𝛾𝛾
𝛾𝛾
Kitaev interaction – bond dependent Isinginteraction
Proposed Honeycomb lattice of Ir4+ as a realization of Heisenberg-Kitaev model
Yogesh Singh, P. Gegenwart PRB 2010
Chaloupka, Jackeli and Khaliullin PRL 2010
Na2IrO3
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SOC too small?F. Ye et al., PRB 85 180403 (2012)
eg
t2g
(leff = 1)
CEF jeff = 1/2
jeff = 3/2
Ir4+ (5d5)
Gretarsson et al. PRL 2013
Na2IrO3RIXS APS
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Well-known semiconductor since 1960’s. Used as a catalyst
α-RuCl3
K. W. Plumb, et al., Phys. Rev. B 90, 041112 (2014)
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Spin-Orbit exciton in α-RuCl3eg
t2g
(leff = 1)
CEF jeff = 1/2
jeff = 3/2
Ir4+ (5d5)
Elastic FWHM = 50 meV
SO excitation FWHM = 150 meV
position = 230 meV
λ ~ 150 meV
What about B and C?
A
BC
NSLS IISIXRu M3 edge
Details: Poster by B. Lebert PT-31
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New fractional excitations
RIXS couples to itinerant Majorana fermions (similar to Raman, but can measure dispersion
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New soft x-ray beamlines pushing the resolution limits Need to explore other elements and edges New sources: XFEL, Diffraction-limited storage rings Time resolved RIXS And beyond
Future of RIXS
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Summary
An exciting time for RIXS Many materials beyond cuprates are being investigated
using RIXS, headed by iridates Magnons
Orbital, dd, CEF excitations Useful for identifying
Kitaev materials
Na2IrO3RIXS APS