Role of magnetic exchange energy on charge ordering in R(1/3)Sr(2/3)FeO(3) (R = La, Pr, and Nd)

TitleRole of magnetic exchange energy on charge ordering in R(1/3)Sr(2/3)FeO(3) (R = La, Pr, and Nd)
Publication TypeJournal Article
Year of Publication2011
AuthorsMa J, Yan JQ, Diallo SO, Stevens R, Llobet A, Trouw F, Abernathy DL, Stone MB, McQueeney RJ
Journal TitlePhysical Review B
Volume84
Pages224115
Date Published12
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000298556000006
Keywordscrystal-field levels, neutron-scattering, ORTHOFERRITES, oxides, spin, states, TRANSITIONS
Abstract

Inelastic neutron scattering is applied to study the role of magnetism in stabilizing the charge-ordered state in R(1/3)Sr(2/3)FeO(3) (RSFO) (R = La, Pr, and Nd). The ratio of the ferromagnetic exchange energy J(F) and antiferromagnetic exchange energy J(AF), |J(F)/J(AF)|, is a key indicator of the stability of the charge-ordered and antiferromagnetic ordered state. This ratio is obtained from the spin-wave spectrum by inelastic neutron scattering and is sufficiently large to suggest that the magnetic exchange energy alone can stabilize the charge-ordered state in La(1/3)Sr(2/3)FeO(3) and Pr(1/3)Sr(2/3)FeO(3). The exchange ratio decreases from La(1/3)Sr(2/3)FeO(3) to Nd(1/3)Sr(2/3)FeO(3), which indicates a gradual destabilization of the magnetic exchange mechanism for charge ordering in correspondence with the observed reduction in the ordering temperature.

DOI10.1103/PhysRevB.84.224115
Alternate JournalPhys. Rev. B