A-site substitution effect on physical properties of Sr3Fe 2-xCoxO7-δ

J. Tozawa, M. Akaki, D. Akahoshi, H. Kuwahara, K. Itatani

Research output: Contribution to journalConference articlepeer-review


We have investigated the Ln3+ -substitution (Ln = lanthanoid) effect of a quasi two-dimensional ferromagnet Sr3Fe 2-xCoxO7-δ (x = 0.5). With increasing Ln3+-concentration, the ferromagnetism is gradually suppressed and the resistivity is increasing, which are ascribed to an increase in antiferromagnetic (AFM) clusters created by Ln3+-substitution. In Sr2.7Gd0.3Fe1.5Co0.5O 7-δ, the magnetoresistance (MR) is enhanced by about 20 % compared with that of Sr3Fe1.5Co0.5O 7-δ. Coexistence of ferromagnetic (FM) and AFM phases is essential for the enhancement of the MR. Applied magnetic fields align the FM clusters in the same direction, resulting in a reduction in the resistivity. A metamagnetic transition observed in the Ln3+-doped samples also contributes to the enhancement of the MR.

Original languageEnglish
Article number012209
JournalJournal of Physics: Conference Series
Issue numberSECTION 1
Publication statusPublished - 2010
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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