| Autor: |
Johnson, R. D., Khalyavin, D. D., Manuel, P., Radaelli, P. G., Glazkova, I. S., Terada, N., Belik, A. A. |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. B 96, 054448 (2017) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.96.054448 |
| Popis: |
Through analysis of variable temperature neutron powder diffraction data, we present solutions for the magnetic structures of SrMn$_7$O$_{12}$, CdMn$_7$O$_{12}$, and PbMn$_7$O$_{12}$ in all long-range ordered phases. The three compounds were found to have magnetic structures analogous to that reported for CaMn$_7$O$_{12}$. They all feature a higher temperature lock-in phase with \emph{commensurate} magneto-orbital coupling, and a delocked, multi-\textbf{k} magnetic ground state where \emph{incommensurate} magneto-orbital coupling gives rise to a constant-moment magnetic helix with modulated spin helicity. CdMn$_7$O$_{12}$ represents a special case in which the orbital modulation is commensurate with the crystal lattice and involves stacking of fully and partially polarized orbital states. Our results provide a robust confirmation of the phenomenological model for magneto-orbital coupling previously presented for CaMn$_7$O$_{12}$. Furthermore, we show that the model is universal to the $A^{2+}$ quadruple perovskite manganites synthesised to date, and that it is tunable by selection of the $A$-site ionic radius. |
| Databáze: |
arXiv |
| Externí odkaz: |
|
