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• W3094222278 abstract "Abstract We have successfully grown centimeter-sized layered $$textit{R}mathrm{SrNiO}_{4}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>R</mml:mi> <mml:msub> <mml:mi>SrNiO</mml:mi> <mml:mn>4</mml:mn> </mml:msub> </mml:mrow> </mml:math> 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 $$sim 77~mathrm{K}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mo>∼</mml:mo> <mml:mn>77</mml:mn> <mml:mspace /> <mml:mi>K</mml:mi> </mml:mrow> </mml:math> 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 $$mathrm{Ni}^{3+}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mrow> <mml:mi>Ni</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> <mml:mo>+</mml:mo> </mml:mrow> </mml:msup> </mml:math> system." @default.
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• W3094222278 date "2020-10-22" @default.
• W3094222278 modified "2023-10-17" @default.
• W3094222278 title "Charge disproportionation and nano phase separation in $$textit{R}mathrm{SrNiO}_{4}$$" @default.
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• W3094222278 doi "https://doi.org/10.1038/s41598-020-74884-2" @default.
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