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  Charge disproportionation and nano phase separation in RSrNiO4

Guo, H., Li, Z. W., Chang, C. F., Hu, Z., Kuo, C.-Y., Perring, T. G., et al. (2020). Charge disproportionation and nano phase separation in RSrNiO4. Scientific Reports, 10(1): 18012, pp. 1-11. doi:10.1038/s41598-020-74884-2.

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Guo, H.1, Autor           
Li, Z. W.1, Autor           
Chang, C. F.2, Autor           
Hu, Z.3, Autor           
Kuo, C.-Y.1, Autor           
Perring, T. G.4, Autor
Schmidt, W.4, Autor
Piovano, A.4, Autor
Schmalzl, K.4, Autor
Walker, H. C.4, Autor
Lin, H. J.4, Autor
Chen, C. T.4, Autor
Blanco-Canosa, S.4, Autor
Schlappa, J.4, Autor
Schüßler-Langeheine, C.4, Autor
Hansmann, P.4, Autor
Khomskii, D. I.4, Autor
Tjeng, L. H.5, Autor           
Komarek, A. C.6, Autor           
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2Chun-Fu Chang, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863447              
3Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              
4External Organizations, ou_persistent22              
5Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              
6Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863446              

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Schlagwörter: article; excitation; phase separation
 Zusammenfassung: We have successfully grown centimeter-sized layered RSrNiO 4 single crystals under high oxygen pressures of 120–150 bar by the floating zone technique. This enabled us to perform neutron scattering experiments where we observe close to quarter-integer magnetic peaks below ∼77K that are accompanied by steep upwards dispersing spin excitations. Within the high-frequency Ni–O bond stretching phonon dispersion, a softening at the propagation vector for a checkerboard modulation can be observed. We were able to simulate the magnetic excitation spectra using a model that includes two essential ingredients, namely checkerboard charge disproportionation and nano phase separation. The results thus suggest that charge disproportionation is preferred instead of a Jahn–Teller distortion even for this layered Ni 3 + system. © 2020, The Author(s).

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Sprache(n): eng - English
 Datum: 2020-10-222020-10-22
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1038/s41598-020-74884-2
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Titel: Scientific Reports
  Kurztitel : Sci. Rep.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: London, UK : Nature Publishing Group
Seiten: - Band / Heft: 10 (1) Artikelnummer: 18012 Start- / Endseite: 1 - 11 Identifikator: ISSN: 2045-2322
CoNE: https://pure.mpg.de/cone/journals/resource/2045-2322