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Site-Selective Probe of Magnetic Excitations in Rare-Earth Nickelates Using Resonant Inelastic X-ray Scattering

Lu, Y.; Betto, D.; Fürsich, K.; Suzuki, H.; Kim, H.-H.; Cristiani, G.; Logvenov, G.; Brookes, N. B.; Benckiser, E.; Haverkort, M. W.; Khaliullin, G.; Le Tacon, M.; Minola, M.; Keimer, B.

We use high-resolution resonant inelastic x-ray scattering (RIXS) to study a thin film of
, a compound whose unusual spin- and bond-ordered electronic ground state has been of long-standing interest. Below the magnetic ordering temperature, we observe well-defined collective magnon excitations along different high-symmetry directions in momentum space. The magnetic spectra depend strongly on the incident photon energy, which we attribute to RIXS coupling to different local electronic configurations of the expanded and compressed
octahedra in the bond-ordered state. Both the noncollinear magnetic ground state and the observed site-dependent magnon excitations are well described by a model that assumes strong competition between the antiferromagnetic superexchange and ferromagnetic double-exchange interactions. Our study provides direct insight into the magnetic dynamics and exchange interactions of the rare-earth nickelates and demonstrates that RIXS can serve as a site-selective probe of magnetism in these and other materials.

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Verlagsausgabe §
DOI: 10.5445/IR/1000084863
Veröffentlicht am 26.07.2018
DOI: 10.1103/PhysRevX.8.031014
Zitationen: 1
Web of Science
Zitationen: 1
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 2160-3308
KITopen-ID: 1000084863
HGF-Programm 43.21.01 (POF III, LK 01)
Erschienen in Physical review / X
Band 8
Heft 3
Seiten 031014/1-9
Vorab online veröffentlicht am 18.07.2018
Nachgewiesen in Web of Science
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