| Autor: |
Gnezdilov, V. P., Pashkevich, Yu. G., Kurnosov, V. S., Zhuravlev, O. V., Wulferding, D., Lemmens, P., Menzel, D., Kozlyakova, E. S., Akhrorov, A. Yu., Kuznetsova, E. S., Berdonosov, P. S., Dolgikh, V. A., Volkova, O. S., Vasiliev, A. N. |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. B 99, 064413 (2019) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.99.064413 |
| Popis: |
Fe$^{3+}$ $S = 5/2$ ions form saw-tooth like chains along the $a$ axis of the oxo-selenite Fe$_2$O(SeO$_3$)$_2$ and an onset of long-range magnetic order is observed for temperatures below $T_C = 105$ K. This order leads to distinct fingerprints in phonon mode linewidths and energies as resolved by Raman scattering. In addition, new excitations with small linewidths emerge below $T = 150$ K, and are assigned to two-magnon scattering processes with the participation of flat-band and high energy magnon branches. From this a set of exchange coupling constants is estimated. The specific ratio of the saw-tooth spine-spine and spine-vertex interactions may explain the instability of the dimer quantum ground state against an incommensurate 3D magnetic order. |
| Databáze: |
arXiv |
| Externí odkaz: |
|
