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

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

doi:10.1088/1742-6596/200/1/012209

A-site substitution effect on physical properties of Sr₃Fe _2-xCo_xO_7-δ

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

Research output: Contribution to journal › Conference article › peer-review

Abstract

We have investigated the Ln³⁺ -substitution (Ln = lanthanoid) effect of a quasi two-dimensional ferromagnet Sr₃Fe _2-xCo_xO_7-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 Sr_2.7Gd_0.3Fe_1.5Co_0.5O _7-δ, the magnetoresistance (MR) is enhanced by about 20 % compared with that of Sr₃Fe_1.5Co_0.5O _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 language	English
Article number	012209
Journal	Journal of Physics: Conference Series
Volume	200
Issue number	SECTION 1
DOIs	https://doi.org/10.1088/1742-6596/200/1/012209
Publication status	Published - 2010
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1088/1742-6596/200/1/012209

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title = "A-site substitution effect on physical properties of Sr3Fe 2-xCoxO7-δ",

abstract = "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.",

author = "J. Tozawa and M. Akaki and D. Akahoshi and H. Kuwahara and K. Itatani",

year = "2010",

doi = "10.1088/1742-6596/200/1/012209",

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journal = "Journal of Physics: Conference Series",

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T1 - A-site substitution effect on physical properties of Sr3Fe 2-xCoxO7-δ

AU - Tozawa, J.

AU - Akaki, M.

AU - Akahoshi, D.

AU - Kuwahara, H.

AU - Itatani, K.

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

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A-site substitution effect on physical properties of Sr₃Fe _2-xCo_xO_7-δ

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