Magnetoresistance Effects in SrFeO 3-G : Dependence on Phase Composition and Relation to Magnetic and Charge Order - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2006

Magnetoresistance Effects in SrFeO 3-G : Dependence on Phase Composition and Relation to Magnetic and Charge Order

Résumé

Single crystals of iron(IV) rich oxides SrFeO 3-with controlled oxygen content (0 G have been studied by Mössbauer spectroscopy, magnetometry, magnetotransport measurements, Raman spectroscopy, and infrared ellipsometry in order to relate the large magnetoresistance (MR) effects in this system to phase composition, magnetic and charge order. It is shown that three different types of MR effects occur. In cubic SrFeO 3 (G = 0) a large negative MR of 25% at 9 T is associated with a hitherto unknown 60 K magnetic transition and a subsequent drop in resistivity. The 60 K transition appears in addition to the onset of helical ordering at ~130 K. In crystals with vacancy-ordered tetragonal SrFeO 3-¡ as majority phase (G ~0.15) a coincident charge/antiferromagnetic ordering transition near 70 K gives rise to a negative giant MR effect of 90% at 9 T. A positive MR effect is observed in tetragonal and orthorhombic materials with increased oxygen deficiency (G = 0.19, 0.23) which are insulating at low temperatures. Phase mixtures can result in a complex superposition of these different MR phenomena. The MR effects in SrFeO 3-¡ differ from those in manganites as no ferromagnetic states are involved.
Fichier principal
Vignette du fichier
0512510.pdf (1.3 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03201582 , version 1 (19-04-2021)

Identifiants

Citer

P Adler, Alexandre Lebon, V Damljanoviü, C Ulrich, C Bernhard, et al.. Magnetoresistance Effects in SrFeO 3-G : Dependence on Phase Composition and Relation to Magnetic and Charge Order. Physical Review B, 2006, ⟨10.1103/PhysRevB.73.094451⟩. ⟨hal-03201582⟩

Collections

UNIV-BREST
17 Consultations
63 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More