Abstract:
:We have successfully grown centimeter-sized layered [Formula: see text] 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 [Formula: see text] 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 [Formula: see text] system.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Guo H,Li ZW,Chang CF,Hu Z,Kuo CY,Perring TG,Schmidt W,Piovano A,Schmalzl K,Walker HC,Lin HJ,Chen CT,Blanco-Canosa S,Schlappa J,Schüßler-Langeheine C,Hansmann P,Khomskii DI,Tjeng LH,Komarek ACdoi
10.1038/s41598-020-74884-2subject
Has Abstractpub_date
2020-10-22 00:00:00pages
18012issue
1issn
2045-2322pii
10.1038/s41598-020-74884-2journal_volume
10pub_type
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