| Autor: |
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. |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
Sci. Rep. 10, 18012 (2020) |
| Druh dokumentu: |
Working Paper |
| Popis: |
We have successfully grown centimeter-sized layered $R$SrNiO$_4$ single crystals under high oxygen pressures of 120 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$77 K that are accompanied by steep upwards dispersing spin excitations. Within the high-frequency Ni-O bond stretching phonon dispersion, a softening at the propagation vector for a checkerboard modulation can be observed. Together with our spin wave simulations these observations reveal that this Ni$^{3+}$ system exhibits charge disproportionation with charges segregating into a checkerboard pattern within a nano phase separation scenario rather than showing a Jahn-Teller effect. |
| Databáze: |
arXiv |
| Externí odkaz: |
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