Com4Com

Collective modes in 4d-metal compounds and heterostructures

CoordinatorMax Planck Society
Grant period2016-01-01 - 2021-09-30
Funding bodyEuropean Union
Call numberERC-2014-ADG
Grant number669550
IdentifierG:(EU-Grant)669550

Note: Compounds of transition metals with 4d valence electrons (“4d metals”) play eminent roles in many areas of condensed matter physics ranging from unconventional superconductivity to oxide electronics, but fundamental questions about the interplay between the spin-orbit coupling and electronic correlations at the atomic scale remain unanswered. Momentum-resolved spectroscopies of collective electronic excitations yield detailed insight into the magnitude and spatial range of the electronic correlations, and have thus decisively shaped the conceptual understanding of quantum many-body phenomena in 3d-electron systems. We will devise and build a novel resonant inelastic x-ray scattering (RIXS) instrument capable of determining the dispersion relations of electronic collective modes in 4d-metal compounds with full momentum-space coverage, high energy resolution, and monolayer sensitivity. Data from this instrument will yield comprehensive information about the interaction parameters specifying the electronic Hamiltonians of 4d-electron materials, unique insight into the spin-orbital composition of their excited-state wavefunctions, and definitive tests of proposals to realize Kitaev models with spin-liquid states that are potentially relevant in topological quantum computation. The element-specificity of RIXS will also allow us to determine the microscopic exchange interactions in complex materials with both 3d and 4d valence electrons, and its high sensitivity will enable experiments on operational device structures comprising only a few monolayers. We will thus be able to tightly integrate momentum-resolved spectroscopy with state-of-the-art, monolayer-by-monolayer deposition methods of 4d metal-oxide films and heterostructures. The results will fuel a feedback loop comprising synthesis, characterization, and modeling, which will greatly advance our ability to design materials and devices whose functionality derives from the collective organization of electrons.
     

Recent Publications

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$J = ^1_2$ pseudospins and $d − p$ hybridization in the Kitaev spin liquid candidates $RuX_3$ ( X =Cl, Br, I)
Physical review / B 109(18), L180413 () [10.1103/PhysRevB.109.L180413]  GO OpenAccess  Download fulltext Files BibTeX | EndNote: XML, Text | RIS

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Resonant Inelastic X-ray Scattering Studies of Magnetic Excitations in Ru-Based Quantum Magnets
Nihon-butsuri-gakkai-shi 79(5), 230 - 235 () [10.11316/butsuri.79.5_230]  GO  Download fulltext Files  Download fulltextFulltext BibTeX | EndNote: XML, Text | RIS

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Distinct spin and orbital dynamics in Sr$_2$RuO$_4$
Nature Communications 14(1), 7042 () [10.1038/s41467-023-42804-3]  GO OpenAccess  Download fulltext Files BibTeX | EndNote: XML, Text | RIS

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Resonant inelastic x-ray scattering from electronic excitations in $α$ − RuCl$_3$ nanolayers
Physical review / B 108(4), L041406 () [10.1103/PhysRevB.108.L041406]  GO OpenAccess  Download fulltext Files BibTeX | EndNote: XML, Text | RIS

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Spin and charge excitations in the correlated multiband metal $Ca_{3}Ru_{2}O_{7}$
Physical review / B 103(8), 085108 () [10.1103/PhysRevB.103.085108]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext BibTeX | EndNote: XML, Text | RIS

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Synthesis and Electronic Ordering Phenomena of Calcium Ruthenate Thin Films
Universität Stuttgart 238 pp. () [10.18419/OPUS-10069] = Dissertation, University of Stuttgart, 2018  GO OpenAccess  Download fulltext Files  Download fulltextFulltext BibTeX | EndNote: XML, Text | RIS

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 Record created 2015-09-15, last modified 2023-02-10



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