Spin orders in the charge disproportionated phases of A-site layer ordered triple perovskite LaCa2Fe3O9 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2018

Spin orders in the charge disproportionated phases of A-site layer ordered triple perovskite LaCa2Fe3O9

Résumé

The coupling between spins and charge disproportionation states has been investigated in the LaCa 2 Fe 3 O 9 oxide with neutron powder diffraction. This A-site layer ordered triple perovskite LaCa 2 Fe 3 O 9 undergoes charge disproportionation on cooling and shows two different charge ordering patterns. At 230 K, Fe 3.67+ disproportionates into a 2:1 ratio of Fe 3+ :Fe 5+ which order in a layered manner along the <010> direction of the pseudocubic unit cell. At lower temperatures (T < 170 K), the charge ordering pattern changes to a layered arrangement along the <111> direction. Neutron powder diffraction data shows that in the intermediate temperature range (170 K < T < 230 K) the spins order into a cycloidal structure on the ac plane for the Fe 3+ cations while the Fe 5+ cations remain paramagnetic. For the lowest temperature range (2 K < T < 190 K), the spin structure follows the charge ordering and evolves to a <111> layered magnetic structure. Introduction.
Fichier principal
Vignette du fichier
PRB_LaCa2Fe3O9.pdf (476.23 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02292335 , version 1 (19-09-2019)

Identifiants

Citer

Angel M Arevalo-Lopez, Yoshiteru Hosaka, Haichuan Guo, Fabio Denis Romero, Takashi Saito, et al.. Spin orders in the charge disproportionated phases of A-site layer ordered triple perovskite LaCa2Fe3O9. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2018, 97 (2), ⟨10.1103/PhysRevB.97.024421⟩. ⟨hal-02292335⟩
40 Consultations
74 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More