Author:
Guo H.,Li Z. W.,Chang C. F.,Hu Z.,Kuo C.-Y.,Perring T. G.,Schmidt W.,Piovano A.,Schmalzl K.,Walker H. C.,Lin H. J.,Chen C. T.,Blanco-Canosa S.,Schlappa J.,Schüßler-Langeheine C.,Hansmann P.,Khomskii D. I.,Tjeng L. H.,Komarek A. C.
Abstract
AbstractWe have successfully grown centimeter-sized layered $$\textit{R}\mathrm{SrNiO}_{4}$$
R
SrNiO
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 $$\sim 77~\mathrm{K}$$
∼
77
K
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 $$\mathrm{Ni}^{3+}$$
Ni
3
+
system.
Funder
Deutsche Forschungsgemeinschaft
Projekt DEAL
Publisher
Springer Science and Business Media LLC
Cited by
2 articles.
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